If your child’s clinician has mentioned “fissure seals” or “sealants” at a check-up, you might be wondering what they are and whether your child actually needs them. The good news is that fissure seals are one of the simplest, gentlest things we do at Tooth Town — there’s no drilling, no needles and usually no fuss at all. This guide explains what fissure seals are, how they help protect your child’s back teeth, and what to expect if your child’s clinician recommends one.
What is a fissure seal?
Fissure seals are a thin protective coating applied to the chewing surfaces of back teeth, usually the molars. These teeth naturally have small grooves and dips — called fissures — across their biting surface. A fissure seal flows into those grooves and sets to form a smooth, protective barrier over them.
The seal itself doesn’t change how a tooth looks or feels to your child. It’s simply a preventive layer that sits over an area of the tooth that can be harder to keep clean.
Why the grooves on back teeth need extra help
The deep grooves on molars are a normal part of how these teeth are shaped, but they can make thorough brushing more difficult. Even with careful brushing, a toothbrush bristle may not always reach right into the base of a narrow fissure. Food and plaque can settle into these grooves, which is part of why back teeth are more prone to decay than the smoother, easier-to-clean surfaces of other teeth.
A fissure seal helps by covering these grooves, making the surface smoother and easier to keep clean — reducing the areas where plaque and food can become trapped.
How the seal is applied
Applying a fissure seal is usually quick and can often be done at a routine check-up visit. In general, the process involves:
- Cleaning and preparing the surface of the tooth
- Applying the seal material into the grooves
- Setting the seal, often using a curing light
There’s no drilling and no injection involved, which is part of why fissure seals tend to be so well tolerated — even by children who feel anxious about dental visits. Most children find the whole process comfortable, and it’s often completed in just a few minutes per tooth.
How long do seals last?
Fissure seals are designed to be durable, but like any part of the mouth, they’re checked over time. At your child’s regular check-ups, your child’s clinician will look at the seal and confirm it’s still intact and doing its job. If a seal has worn or chipped in places, it can generally be reapplied or topped up as needed.
This is one of the reasons regular check-ups matter — they give us the chance to keep an eye on seals (and everything else) and address anything early, calmly and simply.
Does every child need fissure seals? Does every tooth need one?
Not necessarily. Whether a fissure seal is recommended depends on the individual tooth — things like how deep its grooves are and how at-risk that particular tooth may be. This is a decision your child’s clinician makes after examining your child, not something that applies the same way to every child or every tooth.
If a seal isn’t recommended for a particular tooth, it doesn’t mean anything is wrong — it simply means your child’s clinician has assessed that tooth and decided a seal isn’t the right fit for it at this time.
Fissure seals are prevention, not treatment
It’s worth understanding that fissure seals are a preventive measure. They’re designed to reduce the risk of decay starting in a tooth’s grooves — they aren’t a treatment for decay that’s already present. If a tooth already has decay, your child’s clinician will talk you through the appropriate treatment options for that tooth instead.
Fissure seals also aren’t a stand-alone solution. They work best as one part of a broader prevention plan that includes regular brushing, a healthy diet that helps limit tooth decay risk, and appropriate fluoride use, alongside regular check-ups.
Frequently asked questions
Does getting a fissure seal hurt?
No. There’s no drilling and no injection involved, which makes it one of the more comfortable things we do at a check-up. Most children tolerate it very well.
Will fissure seals stop my child from ever getting a cavity?
No treatment can guarantee that. Fissure seals reduce the risk of decay starting in the grooves of back teeth, but they work alongside — not instead of — good brushing, a healthy diet and regular check-ups.
Can fissure seals be applied to baby teeth as well as adult teeth?
Your child’s clinician will assess each tooth individually and let you know which teeth, if any, are suitable for a seal.
What if my child already has a filling in that tooth?
Fissure seals are a preventive measure for tooth surfaces that haven’t decayed. If a tooth already needs treatment, your child’s clinician will explain the appropriate options for that specific tooth.
How will I know if my child needs a fissure seal?
Your child’s clinician will assess this at a check-up and let you know if a seal is recommended, and for which teeth.
Do I need to do anything differently at home once a seal is placed?
No special routine is needed — keep up your child’s normal brushing, diet and fluoride habits. Your child’s clinician will let you know if anything specific applies to your child.
What to do next
If you’d like to know whether fissure seals may be suitable for your child, our team is happy to talk it through at their next check-up. Book an appointment and we’ll assess your child gently, explain what we find, and let you know if a seal — or anything else — is recommended.
This guide is general information and doesn’t replace an individual assessment. Your child’s clinician will confirm what’s most appropriate for them after examination.