Dental sealants are thin protective coatings painted onto the chewing surfaces of back teeth, mainly molars and premolars. They cover the deep grooves and pits where food and plaque bacteria tend to collect, creating a smooth barrier that is easier to keep clean.
Sealants are a preventive treatment most often recommended for children and teenagers, especially as their permanent molars come through, but some adults can benefit too. Used as dental sealants for cavities, they lower the risk of decay on the surfaces they cover.
Sealants work best alongside brushing with fluoride toothpaste, cleaning between your teeth and regular dental check-ups. They do not prevent every cavity, and they are not right for every tooth. How the teeth are developing, any existing decay and your overall cavity risk all decide whether they suit you or your child. This guide from O’Ville Dental in Orangeville explains how dental sealants work, who they help, what to expect and how long they last.
What Are Dental Sealants and How Do They Work?
Dental sealants are thin coatings that flow into the pits and fissures (deep grooves) on the chewing surfaces of teeth and harden into a protective shield. The CDC describes sealants as a barrier that blocks germs and food from the chewing surfaces of back teeth.
What sealants are made of
Most sealants are made from a resin (a tooth-safe plastic material). Some are made from glass ionomer, a material that releases a small amount of fluoride and is more tolerant of moisture. Your dentist chooses the material based on the tooth’s condition, how easily it can be kept dry and other clinical needs.
How they work
The liquid sealant is painted into the grooves, where it fills the narrow spaces that bristles cannot reach. It then hardens, leaving a smooth surface that food and bacteria are less likely to stick to.
Which teeth usually get sealants?
Permanent molars are the most common choice because their deep grooves are hard to clean. Premolars and some baby teeth may also be sealed when your dentist thinks it will help.
How sealants and fluoride work together
Sealants protect the grooves on chewing surfaces, while fluoride strengthens enamel across the rest of the tooth. They do different jobs, so many preventive plans include both, and sealants never replace fluoride toothpaste. Learn more about Fluoride Treatment and how it compares.
Who Can Benefit From Dental Sealants?
Dental sealants are most often recommended for children and teenagers, but adults with deep grooves and a higher risk of decay can also benefit. A dentist decides tooth by tooth, rather than by age.
Children with new permanent molars
The first permanent molars usually come through around age six, and the second molars around age twelve, although timing varies. New molars are especially vulnerable to decay, which is why tooth sealants for children are often placed soon after these teeth appear.
Teenagers with higher cavity risk
Teens with deep grooves, frequent sugary snacks or a history of cavities may benefit. Individual risk should guide the decision.
Adults with deep grooves
Adults with healthy, unfilled chewing surfaces and a higher risk of decay may be good candidates. The CDC notes that sealants can also be applied in adulthood.
People with a history of decay
Past cavities often point to a higher chance of future ones. Your dentist looks at this alongside other factors.
Children who find brushing back teeth hard
Younger children, or anyone who struggles to reach their back molars, may benefit from the extra protection.
Teeth with very early, non-cavitated changes
Sometimes a dentist may place a sealant over a carefully checked early white spot that has not yet formed a hole, to help stop it progressing. A tooth with an actual cavity usually needs a filling instead.
What dentists look at before recommending sealants
- How far the tooth has come through and developed.
- How deep the pits and grooves are.
- Any existing decay.
- Past cavity history.
- Oral hygiene habits.
- How often sugar is eaten or drunk.
- Whether the tooth can be kept dry during placement.
- Overall cavity risk.
The Canadian Dental Association supports placing sealants after a dentist’s diagnosis and risk assessment, rather than routinely for everyone. Not every patient needs them.
How Do Dental Sealants Help Prevent Tooth Decay?
Dental sealants help prevent tooth decay by sealing off the deep grooves where plaque and food get trapped. With those grooves covered, bacteria have fewer places to produce the acids that cause cavities.
Creating a protective barrier
The sealant covers the pits and fissures, so food and bacteria cannot settle into them as easily.
Protecting hard-to-clean surfaces
The grooves on molars can be too deep and narrow for toothbrush bristles to clean fully. Sealing them removes a common hiding place for plaque.
Reducing the risk of cavities
According to the CDC, sealants placed soon after the permanent molars come through can prevent up to 80% of cavities for two years and protect against 50% for up to four years. The CDC also reports that children aged 6 to 11 without sealants have almost three times as many cavities in their first molars as children with sealants.
Supporting children’s preventive care
Protecting new molars during childhood and the teen years may reduce the need for some fillings later. Read more about children’s dentistry in Orangeville.
Part of a wider routine
Sealants work best alongside:
- Brushing twice a day with fluoride toothpaste.
- Cleaning between teeth.
- Limiting frequent sugary foods and drinks.
- Regular dental examinations.
- Fluoride treatments when recommended.
Limitations of sealants
Sealants only protect the surfaces they cover. Cavities can still form between teeth, on unsealed surfaces or under a sealant that has worn or come off. Sealants do not guarantee cavity-free teeth.
What Happens During a Dental Sealant Application?
Dental sealant application is a quick, non-invasive procedure. On a healthy tooth, it usually does not involve drilling or local anesthetic.
- Dental examination: Your dentist checks which teeth are suitable, looking for decay and checking how far the teeth have come through.
- Cleaning the tooth: The tooth is cleaned to remove plaque and debris, so the sealant can stick well.
- Keeping the tooth dry: Cotton rolls, suction or other methods keep saliva away. Dryness is especially important for resin sealants.
- Preparing the surface: A conditioning solution may be applied briefly to help the sealant bond, then rinsed and dried. Steps vary by material.
- Applying the sealant: The liquid is painted carefully into the grooves.
- Hardening: Many resin sealants are set with a special curing light. Some other materials set chemically.
- Checking: Your dentist checks coverage and your bite and makes small adjustments if needed.
What to expect afterward
- You can usually go back to normal activities right away.
- Eating instructions may vary with the material used.
- The tooth may feel slightly different for a short time.
- Keep brushing and flossing as usual.
- Your dentist will check the sealants at future visits.
Some people notice the taste of the materials or the feel of the cotton rolls, but significant discomfort is uncommon. Learn more about our Dental Sealants service.
How Long Do Dental Sealants Last?
Dental sealants can last several years, but there is no guaranteed lifespan. They can wear down, chip or come off, so your dentist checks them at each examination.
Typical lifespan
Some sealants stay in place for many years, while others need repair or replacement sooner.
What affects how long they last
- The type of material.
- How well the sealant was placed.
- The tooth’s position and shape.
- Chewing forces.
- Grinding or clenching.
- Oral hygiene habits.
- Regular dental monitoring.
Signs a sealant needs attention
Sealants are thin and often hard to see, so you may not notice if one has worn or come off. This is why check-ups matter.
Can sealants be reapplied?
Yes, in many cases. Your dentist will check the tooth and can repair or replace a worn or missing sealant if the tooth is still suitable.
Why check-ups matter
Routine Checkups & Cleanings let your dentist check sealant wear and look for new decay.
Caring for teeth with sealants
Keep brushing twice a day with fluoride toothpaste, clean between your teeth daily and attend your recommended dental visits. Sealants are not permanent, and they do not replace daily care.
Dental Sealants in Orangeville
A dental examination is the best way to find out whether sealants suit you or your child.
If you are looking for a dentist in Orangeville, O’Ville Dental offers Dental Sealants. We use a standard resin, painted onto the chewing surfaces of molars and premolars and hardened with a curing light. A standard application needs no drilling and no anesthesia. Many benefit plans cover sealants for children, and some extend coverage to adults in certain cases. We confirm your plan and cost with you before any treatment begins. Related care includes our Family Dental Services for all ages.
Call us to confirm suitability, coverage and appointment availability.
Frequently Asked Questions
What are dental sealants and why are they used?
Dental sealants are thin protective coatings painted onto the chewing surfaces of back teeth to help prevent cavities. They seal deep grooves where plaque and food collect. Sealants are a preventive treatment used alongside brushing, flossing and regular dental care.
Are dental sealants only recommended for children?
No. Sealants are most common for children and teenagers, especially when permanent molars come through, but adults with suitable teeth and a higher cavity risk can also benefit. Your dentist decides based on your individual oral health.
How long do dental sealants last?
Dental sealants can last several years. The material, chewing forces, the tooth’s condition and how well they are maintained all play a part. Routine dental visits help spot sealants that need repairing or replacing.
Does getting dental sealants hurt?
Usually not. A standard application involves no drilling or injections. The tooth is cleaned, prepared and coated, and the sealant is hardened. You may notice minor sensations, but real discomfort is uncommon.
Can you still get cavities if you have dental sealants?
Yes. Sealants protect the chewing surfaces they cover, but not the spaces between teeth or other surfaces. Brushing with fluoride toothpaste, cleaning between teeth, healthy eating habits and regular dental visits are still needed.
A Simple Step in Protecting Young Smiles
Dental sealants are a quick, generally comfortable way to protect the deep grooves of back teeth, where many cavities start. They are especially useful for children with new permanent molars and for anyone at higher risk of decay, as long as they are paired with good daily care.
Wondering whether sealants are right for your family? Ask about them at your child’s next check-up, or book an assessment for yourself. We can check your teeth and explain how sealants fit with brushing, fluoride and regular care. Request an appointment to discuss preventive treatment options and availability.
This article is general information, not dental advice for your situation. Speak with a dentist about your own or your child’s oral health.