Key takeaways
- Sealants coat the deep grooves on back teeth where most childhood cavities start; they are applied quickly and without drilling or needles.
- They are most effective when applied shortly after the permanent molars erupt: around age 6 to 7 for the first molars and 11 to 13 for the second.
- Sealants can last 5 to 10 years and should be checked at every routine visit; a worn sealant can be reapplied easily.
- They protect chewing surfaces only, not between teeth; brushing, flossing and diet still matter alongside them.
Most childhood cavities form in one particular place: the deep grooves on the chewing surfaces of the back teeth. These grooves are narrow enough that toothbrush bristles simply cannot reach inside them. Dental sealants are a straightforward, painless way to seal those grooves before decay starts. Here is what parents need to know.
Quick answer: A sealant is a thin plastic coating applied to the chewing surfaces of back teeth. It seals the grooves where most cavities in children start, takes a few minutes to apply, needs no drilling or anaesthetic, and can last up to 10 years. It is one of the most cost-effective preventive tools in paediatric dentistry.
Why back teeth are particularly vulnerable
The grooves (fissures) on the biting surfaces of molars are much deeper than they appear. Under a microscope they look like narrow canyons, and bacteria happily settle at the bottom where they are protected from brushing. Even children who brush well every day can have plaque building up in these grooves. Sealants eliminate the grooves as a hiding place by filling them with a smooth surface that is easy to clean. Our guide to cavities in children covers the bigger picture of prevention and treatment.
When is the best time to apply them?
The window for each set of molars is shortly after they erupt, before decay has had a chance to start. For the first permanent molars this is typically around age 6 to 7. For the second permanent molars it is around 11 to 13. Ideally sealants are applied within the first year of a molar erupting. They can also be placed on baby teeth if those teeth have deep grooves and the child has a history of decay, though this is less common. A dentist checks at every routine visit whether a new molar has erupted and whether sealing is appropriate.
What the procedure involves
No drilling, no needles, no anaesthetic. The tooth is cleaned, a conditioning gel is applied briefly, the tooth is dried, and the sealant is painted on. A blue curing light hardens it in seconds. The whole process for one tooth takes about 5 to 10 minutes. It is one of the most comfortable dental procedures there is, which matters for children who may be nervous about the dentist. Our post on what to expect at a first dental visit has more on helping children feel at ease.
Are they worth it?
The evidence strongly supports sealants as a cost-effective preventive measure. Studies consistently show they reduce the risk of cavities in sealed teeth by 70 to 80 per cent compared to unsealed teeth over the same period. A sealant costs far less than a filling, and a filling costs far less than the crown or root canal that follows a cavity left too long. For children at any risk of decay, sealants are one of the better value preventive investments available.
Sources & further reading
American Dental Association (MouthHealthy) · NHS, Dental Health · NIDCR, US National Institute of Dental & Craniofacial Research · Indian Dental Association
Dental sealants for children: your questions answered
- Dental sealants
- Cavities in kids: prevention and treatment
- When should your child first visit the dentist?
- Pediatric dentistry
- What smoking does to your teeth and gums
- Dental care for seniors: keeping teeth for life
- When should children start braces?
- A children's dentist for east Pune families
- How to care for your teeth with braces
Want to protect your child's back teeth? Ask us about sealants. Call +91 70287 22200.
Call +91 70287 22200 · Open 7 days, 9 AM–9 PM (5 PM Sun)