Dental Fissure Sealants: A Guide for Parents

As a parent, protecting your child's teeth from decay is a natural priority. You may have heard the term fissure sealants mentioned at a dental check-up, or perhaps you have been searching for ways to reduce your child's risk of cavities — particularly in the back teeth. This guide explains what dental fissure sealants are, how they work, and what you might expect from the process, helping you to ask informed questions at your child's next dental visit.

What are dental fissure sealants and why might children need them? Dental fissure sealants are thin protective coatings applied to the biting surfaces of back teeth — usually the permanent molars — to help reduce the risk of decay in their deep grooves. These grooves can be difficult to clean effectively with a toothbrush. In children at higher risk of tooth decay, a dental professional may recommend sealants as part of a broader preventive care plan.

The back teeth — particularly the molars — have natural grooves and pits on their chewing surfaces called fissures. These fissures are an entirely normal part of tooth anatomy. However, their depth and narrowness can make them difficult to clean thoroughly with an ordinary toothbrush, even with good brushing technique.

Food particles and dental plaque can accumulate in these grooves over time. When bacteria in the mouth break down sugars from food and drink, they produce acids that can gradually erode tooth enamel — a process that, left unchecked, may lead to tooth decay and cavities. Children and teenagers can be particularly susceptible during the years when permanent molar teeth are still newly erupted, as the enamel continues to mature and harden.

This is not a reflection of poor hygiene habits. The anatomy of fissures simply makes certain teeth more vulnerable, regardless of how diligently a child brushes.

Fissure sealants are thin, tooth-coloured or clear resin-based coatings that are applied to the biting surfaces of back teeth. Once set, they create a smooth, sealed surface over the fissures, which can make those areas easier to clean and may help protect the underlying enamel from the effects of plaque and acid.

They are a form of preventive dentistry — not a treatment for existing decay. If a cavity has already formed in a fissure, a different approach, such as a dental filling, would be needed instead.

Fissure sealants have been used in dentistry for several decades and are recognised by NHS guidance and public health dental organisations as a preventive measure that may be appropriate for certain children, particularly those identified as being at higher risk of dental decay.

The most commonly sealed teeth are the permanent first molars, which typically erupt between the ages of six and seven, and the permanent second molars, which usually appear around the ages of eleven to thirteen. Because these teeth erupt earlier than other permanent teeth, they can be at risk during childhood and early adolescence — a period when dietary habits and brushing technique may still be developing.

Premolars and other teeth with pronounced fissures may also occasionally be considered, depending on the individual child's clinical picture. A dentist will assess which teeth, if any, may benefit based on factors including:

• The depth and complexity of the fissures

• The child's individual risk of tooth decay

• The eruption stage and position of the tooth

• Overall oral hygiene and diet

• Whether the child has previously experienced decay in other teeth

Not every child will need or benefit from fissure sealants. A professional assessment is the appropriate way to determine whether they may be suitable.

One of the most reassuring aspects of fissure sealants for children is that the procedure is straightforward and, for most children, entirely comfortable.

1. The tooth is cleaned — the dentist will clean the tooth surface to prepare it for the sealant.

2. The surface is conditioned — a mild solution is applied briefly to help the sealant bond to the enamel. This is rinsed away and the tooth dried.

3. The sealant is applied — the liquid sealant material is carefully painted into the fissures of the tooth.

4. The sealant is set — a special curing light is used to harden the material within seconds.

5. The bite is checked — the dentist will ask your child to bite down gently to ensure the sealant sits comfortably.

The whole process typically takes only a few minutes per tooth.

In most cases, no. Fissure sealant application does not usually require any drilling or removal of tooth structure, and local anaesthetic is not typically needed. The procedure is generally well-tolerated, even by younger children who may be anxious about dental visits. If your child has any particular concerns, it is always worth mentioning these to the dental team beforehand so they can offer additional support.

This is understandably one of the first questions parents ask. Based on current available evidence, fissure sealants are considered safe for use in children when applied by a trained dental professional.

Some parents have previously raised questions about a chemical called bisphenol A (BPA), which is present in some resin-based materials. The current understanding, based on available research and guidance from recognised dental organisations, is that the very small amounts involved in sealant application do not appear to pose a clinically significant risk. However, if you have specific concerns, this is something you can discuss openly with your child's dentist, who can explain the materials they use and address any questions you may have.

Fissure sealants do not weaken the underlying tooth. They sit on top of the enamel surface and do not involve any removal of tooth structure. The General Dental Council requires that dental professionals provide appropriate information to support informed consent, so your dentist should be happy to answer any questions before the procedure takes place.

Key points for this topic are explained in the sections below.

• May help reduce the risk of decay in the fissures of treated teeth

• Can make fissured surfaces easier to clean effectively

• Is a non-invasive, generally pain-free procedure

• May be part of a wider preventive dentistry approach for children at higher risk of cavities

• Does not require drilling or local anaesthetic in most cases

It is equally important to understand what fissure sealants cannot do:

• They do not protect the sides or roots of teeth — only the sealed fissure surface

• They do not eliminate the risk of decay entirely, particularly if diet and oral hygiene are not maintained

• They can wear, chip or partially detach over time, which means regular monitoring is important

• They are not a substitute for brushing, fluoride toothpaste or regular dental check-ups

• They may not be appropriate for every child, and professional assessment is always needed

Sealants work best as one part of a broader approach to children's oral health, alongside good brushing habits, appropriate fluoride use and a balanced diet that limits frequent sugary snacks and drinks.

There is no single definitive answer to this question, and longevity can vary depending on the material used, the individual tooth, the child's bite, and how well they are monitored and maintained.

Research and clinical experience suggest that well-placed fissure sealants can remain intact for several years. Some may last five years or longer; others may show signs of wear or partial loss sooner. Evidence from studies reviewed by dental public health bodies suggests that sealants can provide meaningful protection against fissure decay while they remain fully intact.

Because durability varies, regular dental examinations are essential. Your child's dentist will check the condition of any sealants at routine appointments and can advise whether any need to be replaced or reapplied. Early detection of a partially detached sealant is important, as a sealant that has only partially come away may potentially allow bacteria to become trapped beneath it — which is why follow-up care matters.

Key points for this topic are explained in the sections below.

Fissure sealants do not replace the need for good daily oral hygiene. Children with sealed teeth should continue to:

• Brush twice daily with a fluoride toothpaste appropriate for their age

• Spit, not rinse, after brushing to retain the benefit of fluoride

• Clean between the teeth where recommended by their dentist

• Attend regular dental check-ups as advised

The sealed surfaces become smoother and easier to clean, but the other tooth surfaces — including the sides and the areas between teeth — still require thorough daily attention.

In most cases, children can eat and drink shortly after having fissure sealants placed, though the dental team may give specific aftercare guidance depending on the materials used. It is generally sensible to avoid very hard or sticky foods immediately after the appointment, and your dentist or dental nurse will advise you if there is anything specific to avoid.

If a sealant wears down or chips, the fissure beneath it may once again become exposed to plaque and bacteria. This does not automatically mean a cavity will develop, but it does mean the protective benefit may be reduced.

The important thing is that any changes to a sealant are identified at a routine dental check-up. If necessary, a sealant can often be repaired or replaced. This is another reason why regular dental examinations for children are so valuable — they allow any changes to be monitored and acted upon promptly.

Fissure sealants and fluoride work in complementary but different ways. Fluoride — found in toothpaste, some water supplies and certain professional treatments — helps to strengthen enamel and can reduce the rate of decay across all tooth surfaces. Sealants specifically address the vulnerability of fissured surfaces.

Current UK guidance from NHS and public health bodies recommends that children use fluoride toothpaste as part of their daily routine from when their first tooth appears. The concentration of fluoride appropriate for different age groups is something your child's dental professional can advise on. Where a child has a higher risk of decay, a dentist may discuss additional fluoride measures as part of a broader preventive plan — potentially alongside fissure sealants.

Your child's dentist may raise the possibility of fissure sealants during a routine examination if they consider your child to be at higher risk of decay in the back teeth. Factors that can influence this assessment include:

• Previous experience of decay or fillings in baby or adult teeth

• Deep or pronounced fissures in the permanent molars

• Dietary habits that include frequent sugar consumption

• Oral hygiene challenges

• Medical conditions or medications that may affect oral health

If sealants are suggested, the dentist should explain the reasoning, describe the procedure and give you the opportunity to ask questions before you or your child make a decision. You should never feel pressured. This is a discussion, not a requirement.

Preparing a few questions can help you get the most from a dental visit where fissure sealants might be discussed:

• Is my child's tooth decay risk considered to be higher than average, and why?

• Which specific teeth are you recommending sealants for, and at what stage?

• What would you recommend if we chose not to proceed, and what would you monitor for?

These are entirely reasonable questions, and a good dental professional will welcome them.

If you are wondering whether fissure sealants might be appropriate for your child, the most helpful next step is a conversation with a qualified dentist during a routine check-up. They can assess your child's individual risk profile, the condition and anatomy of their teeth, and discuss what preventive options — including but not limited to sealants — may be worth considering.

Book a dental examination for your child to discuss their preventive care needs with a qualified professional who can offer personalised guidance.

The questions below cover common concerns and practical points to help you decide with confidence.

This article has been written for educational and informational purposes only. It is intended to provide general guidance for parents and carers seeking to understand dental fissure sealants and is not a substitute for professional dental advice, diagnosis or treatment. Every child's dental health is individual, and the suitability of any preventive measure — including fissure sealants — can only be determined through a proper clinical assessment by a qualified dental professional. Nothing in this article should be interpreted as a personal recommendation, clinical diagnosis or guarantee of any treatment outcome. Readers are encouraged to consult a registered dental professional with any concerns about their child's oral health.

Written Date: 18 August 2026 Next Review Date: 18 August 2027