Concerns About Bacteria After Dental Crown Placement: What You Need to Know - Dentistry

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Questions about the dental crown placement process?


Hello, I had four crowns placed on my front teeth last week.
Before they were fixed, the dentist cleaned my teeth and asked me to rinse my mouth.
However, after rinsing and lying down, I felt there was still some toothpaste residue, so I instinctively licked my teeth a few times with my tongue.
Then the dentist began to dry my teeth and placed the crowns.
I'm wondering if licking my teeth could introduce any bacteria that might lead to future cavities under the crowns.
If so, what would you recommend I do? Thank you.

Mr. Crab, 20~29 year old female. Ask Date: 2024/06/01

Dr. Lin Jiayong reply Dentistry


Hello: If the dentures fit well with the teeth and the adhesive is properly filled, there is usually no need for excessive concern, as cavity-causing bacteria require oxygen to cause damage.
As long as there is not excessive or significant micro-leakage between the dentures and the natural teeth, the survival/success rate after 5 years is generally very high.

Reply Date: 2024/06/01

More Info


After the placement of dental crowns, it's natural to have concerns about oral hygiene and the potential for bacteria to cause issues, such as cavities beneath the crowns. Your question about whether licking your teeth after rinsing with mouthwash could introduce bacteria is valid, and it's important to understand the factors that contribute to oral health post-crown placement.

First, it's essential to recognize that dental crowns are designed to fit snugly over the prepared tooth structure. When properly placed, the adhesive used should create a seal that minimizes the risk of bacteria entering beneath the crown. However, if there are any gaps or imperfections in the fit, bacteria can potentially accumulate, leading to decay or other complications.

Regarding your specific concern about licking your teeth after rinsing, while it is possible for bacteria to be present in the mouth, the act of licking your teeth is unlikely to introduce a significant amount of bacteria that would lead to decay under a well-fitted crown. The mouth naturally harbors bacteria, and maintaining good oral hygiene is crucial in managing these bacteria.

Here are some recommendations to ensure the longevity of your crowns and minimize the risk of decay:
1. Maintain Excellent Oral Hygiene: Continue to brush your teeth at least twice a day with fluoride toothpaste and floss daily. Pay special attention to the areas around the crowns, as plaque can accumulate there. Using an interdental brush or a water flosser can also help clean hard-to-reach areas.

2. Regular Dental Check-ups: Schedule regular visits with your dentist for professional cleanings and examinations. Your dentist can monitor the health of your crowns and surrounding gum tissue, ensuring that any potential issues are addressed early.

3. Be Mindful of Your Diet: Limit sugary and acidic foods and beverages, as these can contribute to tooth decay. If you consume these types of foods, try to rinse your mouth with water afterward to help neutralize acids and wash away food particles.

4. Use Antimicrobial Mouthwash: Consider using an antimicrobial mouthwash as part of your oral hygiene routine. This can help reduce the bacterial load in your mouth and provide additional protection against decay.

5. Address Any Concerns Promptly: If you notice any signs of discomfort, swelling, or unusual changes around your crowns, contact your dentist immediately. Early intervention can prevent more serious issues from developing.

6. Avoid Unnecessary Manipulation: While it’s common to want to check your dental work, avoid excessive poking or prodding at your crowns with your tongue or fingers, as this can irritate the gums and potentially disrupt the seal.

In conclusion, while licking your teeth after rinsing is unlikely to cause significant harm, maintaining a diligent oral hygiene routine and regular dental visits is key to preventing any complications with your crowns. If you have ongoing concerns or experience any symptoms, don’t hesitate to reach out to your dentist for further evaluation and peace of mind.

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