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To ask a question, click on any topic below, then scroll to the bottom of the page and fill out the form.

Our resident dentist, Dr. Qin Li, will reply to your question as soon as she can.  We can only respond to questions submitted via the website; we do not respond to questions submitted via email.

Note:  Dr. Li can only reply to general questions about dental practices and procedures and not to questions about your personal dental condition(s), as there are many factors involved in assessing cavities and other dental diseases that cannot be accurately diagnosed without a proper examination.

Thornhill, Vaughan, Richmond Hill Dentist

Silver Diamine Fluoride

An FDA-approved breakthrough therapy for stopping the growth of existing cavities.
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Digital Dental X-Rays

Digital x-rays reduce radiation and provide instant, high-definition results.
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Gum Disease

Many adults currently have some form of gum disease. Find out what causes gum disease and what you can do to prevent it.

Teeth Cleaning

Professional teeth cleaning can help prevent cavities, tartar build-up and gum disease.

Tooth Decay

Fix cavities and restore broken-down teeth to their original beauty.
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Dental Exams

Regular professional examinations can catch problems before they become serious.

Cavity Fillings

Fillings restore the appearance and strength of damaged teeth.
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Tooth Replacement

Replacing missing teeth can restore your smile and prevent further problems.

Dentures

Restore the natural look of your smile and chew with confidence.

Crowns and Bridges

Restore the look and function of damaged teeth.
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Root Canal Treatment

Fix a painful, infected tooth and restore its natural appearance.
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Clenching and Grinding Teeth (Bruxism)

Find out what you can do about grinding your teeth.
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Tongue-Tie (Ankyloglossia)

Correcting tongue-tie early can dramatically reduce the probability of serious dental or speech issues.
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Wisdom Teeth Removal

Have your wisdom teeth removed safely and professionally.
Tooth Pain

Laser Cold and Canker Sore Treatment

Heal cold and canker sores quickly, painlessly and effectively.
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Tooth Extractions

Have a problem tooth extracted professionally.
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Bad Breath (Halitosis)

Find out what's causing your bad breath and get professional help.
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Teeth Whitening

Professional teeth whitening can achieve great results in very little time.
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Dental Bonding

Improve the appearance of your teeth with a simple cosmetic procedure.

Cavity Fillings

Fillings restore the appearance and strength of damaged teeth.
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Tooth Replacement

Replacing missing teeth can restore your smile and prevent further problems.

Dentures

Restore the natural look of your smile and chew with confidence.

Crowns and Bridges

Restore the look and function of damaged teeth.
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Implants

One of the most effective ways to replace a missing tooth.

Porcelain Veneers

Improve the appearance of teeth that are stained, damaged, or appear too small or crooked.
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Invisalign® Clear Braces

Clear, removable aligners are a discreet and convenient way to straighten your smile.
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Clear Six Month Smiles® Braces

Get straight teeth in as little as six months with Six Month Smiles clear braces.
Gum Contouring

Laser Gum Contouring

Gum contouring can even out your gum line and improve your smile.
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Bad Breath (Halitosis)

Find out what's causing your bad breath and get professional help.

Don’t see your topic above?  Post your question using the form below!

This Page Has 50 Questions

The information provided below does not constitute dental advice and is general in nature. It does not take into account your personal dental health and should not be acted on without consultation with a certified dental professional.

Bathurst Centre Dental Care accepts no liability for any loss or injury arising out of the use of this website or reliance on the content of this website.

  1. I’ve had several teeth either pulled or sanded down, completely improperly which has left me in an extremely uncomfortable state. What type of dentist should I see and what steps should I take to regrow the enamel on the sanded teeth and put back the teeth that are pulled, making sure they are alive in the process? I’ve been advised of artificial solutions before but per my research they will do even more damage so I will not consider them as an option, nor will I accept an answer that advises me to seek them, only one that will get me my original healthy teeth back. Thank you.

    1. Hi Noah, unfortunately there is currently no commercially available treatment for regrowing enamel or teeth that have been extracted. There is research being done in this area though, so hopefully it’s an option dentists could offer in the future!

  2. Hi. I have two sons, ages 10 and 7. My oldest has white spots on some of his adult teeth, specifically his two upper front teeth and first adult molars. My youngest has one hypoplastic molar in his adult molars. As his front adult upper teeth emerge, at least one is already showing white spots. What causes this? I have been extremely conservative about the use of fluoride and antibiotics. Where we live, the water is not fluoridated. How possible is it that both of them have this from a virus or mouth trauma?

    1. Hi Karen, white spots (also known as hypoplasia) on one or two adult teeth is relatively common, although most of the time it’s difficult to identify the exact cause. Both environmental and hereditary factors could be at play. Fluorosis is a common culprit, although it sounds unlikely in your children’s case. The most current recommendation for preschoolers is to use only a pea-sized amount of toothpaste with fluoride and to make sure they spit out the toothpaste and do not swallow it. Hypoplasia can also be caused by local infection from baby tooth decay or trauma to the mouth during the development of permanent teeth (such as a hard bump on a table corner, biting into a fork too hard, rough play with siblings, a sports injury, etc.). Other factors include viral infection while calcification of the teeth is still occurring. Most of the time, it’s really hard to pinpoint a specific event or cause for the white spots. If you’re concerned about them, I would encourage you to make an appointment to see your dentist.

  3. My tongue seems to be continually covered in a fine (not chunky) white film. I scrape it off with a tongue scrape but it comes back the next time I brush. I brush twice or three times per day and use Listerine or hydrogen peroxide mouthwash.

    1. Hi Andrea,
      Unfortunately, I cannot tell you what the white film is without a physical exam. There could be many potential causes such as dry mouth from certain medications, or dehydration. It could also be an accumulation of dead tissue or food debris. Please consult your dentist to rule out any potential candidiasis, which is a fungal infection.

  4. Hi I hope you can help me.
    A year ago I had a tooth removed which left communication with the sinus. Last week I had a sinus lift using bone graft. Within five days the bone graft had fallen out of the hole where the communication had been. Im back to square 1. My question is, what was supposed to be holding the bone graft up stopping gravity just letting it fall out ? Because that’s pretty much just what it done. It just fell down into my mouth. 😕

    1. Hi Tim,

      For the sinus lift and bone graft you had, I am going to assume that you had particulate bone placed in. Particulate bone are loose smaller pieces of bone that can be more easily manipulated and packed into places. They are held in place by the sinus membrane on top, existing bone or gum on the surrounding surfaces, and gum facing the mouth is sutured together to prevent the grafting material from falling into the mouth. Sometimes a membrane maybe placed in between the bone graft material and the gum.

      In some grafting cases, a larger single piece of bone or a block bone is needed if the bone defect is large. A block bone graft is usually held in place with mini screws. I hope this helps.

    1. Hi Alex, some chewing gums have sugar. Chewing gum with sugar constantly may increase the likelihood of cavities. Sugarless chewing gum is a better alternative for your teeth. The constant chewing motion will often lead to more muscle fatigue and wear and tear of the jaw joint. Prolonged chewing should be avoided in people with TMJ (jaw joint) pain. The human mouth is full of bacteria, rechewed gum is usually laden with bacteria, something you may want to avoid for better oral health and overall health.

  5. I never can breath from both nostrils since I can remember unless I take afrin type med. Right now. My teeth,gum, everywhere in my face throbs every 2 mins . Only cold fluid calms the pain. What’s going on?

    1. Hi R, please make an appointment with your dentist as soon as you can to see if the pain is caused by a dental infection.

  6. I went to the dentist Tuesdays of this week… A filling came out about 1 month ago back bottom right molar… i put Temp dent to replace it when i thought the pain was manageable. The dentist gave me Amoxicillin and Ibuprofen 800mg today is thursday and im still feeling a lot of pain where i put the Tempdent… My question is should i remove the Temp Dent?

    1. Hi Rodney, please consult your dentist regarding removal of the tempdent. If your dentist prescribed antibiotics because the tooth is abscessed, removing the tempdent may not offer much pain relief. Amoxicillin may temporarily keep the infection from spreading, but you should visit your dentist for a more permanent solution to the abscessed tooth as soon as possible.

  7. Hello. I have second molar moved into the position of first molar using TAD braces. I also now have an implant in the position where second molar used to be and I have to remove the implant or I can just bury the implant under the gums. Would I have to wear a retainer to prevent my second molar from tipping back where it used to be or would the buried implant prevent the movement of first molar?I can’t have more implants unfortunately

    1. Hi Lizo, since the implant is not going to have a crown, it’s unlikely to prevent the crown of the original second molar from tipping back. Please follow the instructions of your orthodontist regarding the use of a retainer for your particular case.

    1. Hi Ian, the healing period after a tooth extraction is dependent on many factors such as your general health, difficulty of the extraction and any post-extraction complications. Typically the hole closes in 7-10 days, but it may take longer if you have medical conditions such as uncontrolled diabetes or dental issues such as post-op infection or dry socket. Smoking and excess intake of alcohol can also delay healing.

  8. Hello, I had invisaligns for less than 2 years and then got retainers that I wore for a few months, but recently I haven’t worn them in a couple months due to distractions from the covid-19 situation and finals for school. I tried to fit them back in today and they were really tight and almost but not quite fitting, and it hurt my teeth a lot to the point where I had to take them out. But my bottom teeth which had shifted slightly more than my top teeth had been more difficult to take the retainer off, and now I just can’t wear the retainers because it’s too much pressure on my teeth. Because of quarantine, I am unable to go to an orthodontist, so I am wondering what I can do? I don’t want my teeth to shift more and more.

    1. Hello Caity, unfortunately, there is not much that can be done at the moment. Once your orthodontist is seeing patients again, a new retainer can be made for you. Please discuss the option of a fixed wire retainer with your orthodontist too.

    1. Hi Morgen, the active ingredients in Sensodyne mouthwash are potassium nitrate which helps reduce tooth sensitivity, and sodium fluoride which is for strengthening tooth structure. There are no active ingredients in Sensodyne mouthrinse that have been shown to reverse gum disease. Please consult with your dentist or hygienist for a mouthrinse based on your gum condition.

  9. Will a light activated treatment that utilizes an LED light as a catalyst to activate the carbamide peroxide gel give you as good results as hydrogen peroxide?

    1. Hi Aliesha, Hydrogen peroxide and carbamide peroxide are both very effective whitening agents; we offer both to our patients. Carbamide peroxide contains hydrogen peroxide at a ratio of 1:3. Therefore a product with 30% carbamide peroxide is equivalent to a product with 10% hydrogen peroxide. A study published in the Journal of the American Dental Association showed that while carbamide peroxide appeared to produce slightly more dramatic results at first, there was no significant difference between products with regard to tooth lightness with equivalent amounts of carbamide peroxide and hydrogen peroxide. https://jada.ada.org/article/S0002-8177(14)62875-0/fulltext

      LED light tends to have a drying effect on teeth; drier teeth will appear to be whiter initially, but the effect doesn’t last long due the constant presence of saliva in our mouths.

      When you are comparing the effectiveness of whitening products, the main thing to look for is the concentration of the active whitening agent(s). It’s also important to evaluate the overall health of your teeth and gums prior to starting treatment, and if you’re planning a DIY (do-it-yourself) treatment, be sure the products you use come from a reputable source and follow all product directions carefully.

  10. hello, I have a dental question. I am 13 years old, I have an overbite and my two front top teeth are crooked as well as some of my bottom teeth are slightly crooked. I am not sure if I should get braces or Invisalign. I have a small gap between my two top front teeth, but I like it so I would like to keep it. I had braces for about 6 months but we had to take them off because my family moved. We are now looking into getting braces to Invisalign. Could you please suggest which of the two would be right for me, and if I need to get braces would the invisible ones be an option? Thank you.

    1. Hi there, unfortunately I cannot give you advice on which orthodontic treatments are the best course of action for you. Because your jaw is still growing, you will need a physical visit to a dentist for a consultation and most likely a panoramic x-ray and cephalometric x-ray along with a study mold or 3D scan to help the dentist to determine the progression of your jaw growth before a treatment option can be finalized.

      In general, Invisalign will take longer and be more expensive than traditional braces. It also requires you to wear your liners 22 hours a day and keep track of when to change to a different set of liners. However, it is much easier to brush and floss your teeth when you are wearing Invisalign as opposed to traditional braces. All those factors will influence you and your family’s decision.

  11. Hi, I wanted to know how I get get rid of the black plague around my gums. It’s behind my front top teeth and a lot of bottom even though I do brush and floss pretty regularly

    1. Hi Rubia, please see a dentist as soon as possible to verify what the blackness around your gum is. It could simply be calcified plaque, known as calculus, which will require professional removal by a dentist or a hygienist. They will be able to give you some pointers on your cleaning and flossing techniques to reduce the amount of calculus that forms in your mouth. The black spots could also be cavities, in which case you would want to get them treated sooner to avoid more serious damage to your teeth.

  12. Hello Dr. Li,

    I was wondering if the upper tooth located most right (at the end) is included in one of the following numbers? #17 27 37 46 47
    I already took out all the wisdom tooth. please let m know thank you.!

    1. Hi Jess, if all wisdom teeth were removed and there are no other missing teeth in the upper right quadrant, then the upper right last tooth is numbered 1.7 in the international and Canadian tooth naming system.

  13. Hi!
    I have a moderate dental florosis, what treatments or products would you recommend (other than veneers/ bonding) ? Also, is fluoride free toothpaste/mouthwash a good options for me?
    Thank you

    1. Hi H, it really depends on the extent of your fluorosis. Veneers and bonding work well for more severe fluorosis. If the fluorosis is limited to a few teeth, or a few spots, Icon treatment may be an option for you. Icon treatment uses micro-invasive technology that fills and reinforces demineralized enamel without drilling, and it infiltrates up to the first third of dentin. It is used for treating early cavities and has shown to work on some fluorosis cases too. You can learn more about the treatment in the link below.

      https://www.dmg-america.com/en/products/product/icon/

      If you’re in the area, feel free to book an examination so we can take a look at your teeth and explore the available treatments in more detail.

  14. Can a flap and graft done using pouch and tunnel technique leave no visual evidence of being done right after it is actually done for one tooth?

    1. Hi Sarah, I had to consult a periodontist regarding your question. If the surgery is done under ideal conditions with an experienced surgeon, then there may be no visual evidence of the surgery right after the procedure. It also highly depends on the type of graft, and where/if any incisions are placed and the healing ability of the individual. In general, an autograft (your own tissue from the palate of your mouth), would work better than other grafting materials. 

  15. I have lost several teeth (upper front) because of acccidents,injuries,etc which left bony ridges which are now rubbing against my opper inside lip causing pain and discomfort…can these ridges be filed or sanded down?

    1. Hi Daisy, sorry to hear about your accidents. First, you’ll want to make sure it is the bony ridge that is rubbing the inside of the lip, not residual roots from the teeth that were lost. Any residual roots in the bone will need to be taken out by the dentist to prevent any possible infection.

      If it the bony ridge that’s rubbing the gum, you can potentially open up the gum and grind down the ridge on the bone. However, you will most likely need those bones to support a denture or an implant. Please visit a dentist as soon as you can to explore potential treatment options.

  16. I chipped my two front teeth. Would it be possible to grind them down since they are already buck or would you fill them? I’m not sure if this is important but they weren’t bleeding when I chipped them. I also haven’t had braces yet and are in need of some so would I get my teeth straightened first?

    1. Hi Bobby, the decision to either polish the chipped edges or to repair the teeth depends on how much of your teeth was chipped off. If the chip is still in the enamel surface, it may be possible to just smooth the chipped edge. Please visit a dentist to assess the situation.

  17. Hi there! I have an asymmetrical smile that has caused me to feel self-conscious all my life. I feel self-conscious often while talking and especially when laughing, I find myself covering my mouth with my hand to limit showing my smile. When I smile the right side is a bit more “gummy” than the other. In addition to this, my teeth (and especially my right lateral incisor) are not well aligned. What should I do to fix my teeth and get a nice smile? Thanks!!

    1. Hi Alex, it’s not possible for me to diagnose what is causing the asymmetrical smile without a proper assessment of your face, lip, teeth and gum. From what you are describing, you may be looking at a combination of braces and possible gum recontouring. An assessment with an orthodontist may be a good starting point for the smile you are looking for.

  18. Hello, I was wondering how long enamel erosion takes to happen at a younger age like teenage years? And if it happens quickly, will you start to see yellow teeth quickly?

    1. Hi Ria, normally we don’t see enamel erosion in teenagers. However, it can happen due to acid regurgitation, bulimia, certain recreational drugs, sucking on lime or lemon for extended periods of time and other reasons. In general, the more frequent the occurrence, the faster the enamel erosion will happen. The enamel will become thin and more transparent and there may be more sensitivity and yes, teeth may also appear more yellow.

  19. Hello, my son is 8 years old but he still hasn’t lost a single baby tooth, but my 2 daughters started losing their teeth when they were 6.i talked to my mom about this and she believes that my son drinks too much milk which makes his teeth stronger and harder for the baby teeth to fall out. Why hasn’t my son lost a tooth at age 8?and is what my mom believes true? Also… What do u recommend i do?

    1. Hi Rea, there is no evidence that suggests drinking more milk causes baby teeth to take longer to fall out. However, studies such as the one listed below have shown that “eruption time in females tends to be earlier than those of the same teeth in males.”

      https://pubmed.ncbi.nlm.nih.gov/15962569/

      If you are really worried, a dentist visit with a dental x-ray will help to estimate how much longer before the permanent teeth come in. If your son has not seen a dentist for a checkup and cleaning yet, it would be a good time to book an appointment.

  20. Hi there! I have severe TMJ due to a connective tissue disorder which causes my jaw to dislocate very easily while talking, chewing, yawning, etc. It causes me a lot of pain so i avoid the dentist like the plague because keeping my mouth open for even a short time really hurts. It’s hard to brush my teeth due to this, so I know that i have cavities and am unable to chew on one side due to a broken tooth. I’m really worried about the health of my gums and teeth and want to get these issues fixed but there is no way i could handle an exam let alone fillings or cleaning. What should i do? Is there a type of dentist i could go to that could use general anesthesia?
    Thank you for the help 🙂

    1. Hi Natalie, you will want to go to a dental office that offers general anesthesia for cleaning and fillings and other dental work. There are general dentists who will regularly have an anesthesiologist and anesthesiologist nurse come to their office so they can offer that service to their patients. In Ontario, Canada, we also have dentists specialized in dental anaesthesiology who can do both general dentistry and sedation.

  21. What is the best treatment for external tooth resorption based on current academic journals? I’ve seen both talks of extraction as the only solution with possibly root canal?

    1. Hi Victoria, according to the 2015 Cochrane Systematic Review of the Intervention for the Management of External root resorption, “treatment is generally on a case‐by‐case basis and there is a lack of evidence regarding the best treatments.”

      Treatment for external root resorption depends on many factors, such as how extensive the resorption is, if there is any pain and infection, where the resorption is along the root, the age of the person, and gum conditions.

      If the external resorption is due to braces, and there is no pain or discomfort, the teeth can be stabilized with wire retainer or other means of splinting. Sometimes root canal treatment combined with surgery to remove the granulation tissue (scar tissue) in the defective area and filling of the resorptive defect may be required. In some cases where the resorption is too extensive, the teeth cannot be saved.

      Please see the article below for reference,
      https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD008003.pub3/full

  22. Is it possible for an adult tooth to grow in at 23 years old? ( Not a wisdom tooth but a canine tooth ) I had my baby one taken out too soon when I was young and was told it would not have room to come down, now I just noticed today that the very tip of it is protruding through the gum, does this mean it might actually come down? Also my wisdom teeth are coming in now, could that have affected this at all?

    1. Hi Jessica, it is unlikely but still possible for a retained tooth to erupt at age 23. However, it may or may not come down all the way to the same level as other teeth.

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