Children and Tooth Decay Prevention: Understanding the Role of Fissure Sealants

Tooth decay is one of the most common childhood health issues in the UK, yet it is largely preventable. Alongside good brushing habits, a healthy diet and regular dental visits, fissure sealants for children are one preventive tool that a dentist may recommend to help protect certain tooth surfaces. This article explains what fissure sealants are, how they may help reduce decay on susceptible surfaces, and how they fit into a broader approach to children's dental health.

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Quick Answer Fissure sealants are thin, protective coatings applied to the biting surfaces of back teeth (molars), where deep grooves make cleaning difficult. They can help reduce the risk of tooth decay developing in those grooves. Sealants do not protect every tooth surface, do not replace fluoride toothpaste, and are not necessarily suitable for every child — a dental professional can advise whether they may be appropriate.

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Why Are Children's Molars Vulnerable to Tooth Decay?

When your child's first permanent molars emerge — usually from around age six — they bring with them a landscape of deep grooves and pits on their biting surfaces. These natural indentations, known as pits and fissures, are part of the normal anatomy of molars and help with chewing. However, they can also be very narrow — sometimes too narrow for a single toothbrush bristle to reach effectively.

Bacteria in the mouth feed on sugars from food and drink, producing acids that can attack tooth enamel (the hard outer layer of a tooth). In deep fissures, plaque (the sticky film of bacteria) can accumulate in areas that are genuinely difficult to clean, even with careful brushing. Over time, this can lead to dental caries (tooth decay) developing within those grooves before a parent or child may notice any visible sign.

The second set of permanent molars, which typically appears from around age 12, presents the same challenge. Because these teeth are meant to last a lifetime, protecting them during the years when decay risk may be highest is an important consideration in children's preventive dental care.

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What Are Fissure Sealants?

Fissure sealants are thin, protective coatings — usually made from a tooth-coloured or clear resin material — that a dentist or dental therapist applies to the biting surfaces of back teeth. Once in place, the sealant fills and covers the deep pits and grooves, creating a smoother surface that is easier to clean and less hospitable to plaque accumulation.

The term dental sealants is sometimes used interchangeably with fissure sealants, particularly in research from other countries. In UK clinical practice, "fissure sealants" remains the more commonly used term.

Sealants are not a filling. They are applied to teeth that are healthy or where only very early signs of enamel change are present, as determined by a dental professional. They cannot be used to treat an existing cavity.

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How Do Fissure Sealants Help Prevent Decay?

The primary mechanism is straightforward: by filling and sealing the grooves on the biting surface, the sealant reduces the space where plaque can collect and bacteria can thrive. The treated surface becomes flatter and smoother, meaning that toothbrush bristles can clean it more effectively.

It is important to understand that fissure sealants:

• Can help reduce the risk of decay on the specific sealed surfaces
• Do not protect the sides, roots or other areas of the tooth
• Do not replace fluoride toothpaste, twice-daily brushing or a reduced-sugar diet
• Are not guaranteed to prevent all decay on sealed surfaces if the sealant becomes damaged, partially lost or inadequately maintained

The evidence supporting fissure sealants as part of a preventive strategy is generally positive, but their effectiveness depends on the integrity of the sealant over time and the continuation of good oral hygiene habits. NHS guidance and relevant dental organisations recognise sealants as a useful preventive option in appropriate cases.

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Which Children May Benefit From Fissure Sealants?

Not every child will need or benefit from fissure sealants. Suitability is assessed individually and depends on a range of factors, including:

• The depth and shape of the fissures on the child's teeth — deeper, narrower grooves may present greater difficulty in cleaning
• The child's individual caries risk, which a dental professional will assess during an examination
• Whether the tooth has fully erupted and the surface is accessible for application
• The condition of the tooth — sealants are applied to sound (healthy) or minimally affected enamel, not to teeth with existing cavities
• The child's ability to cooperate with the procedure

Children who have previously experienced tooth decay, who have deep and pronounced fissures, or who are assessed as being at higher risk of caries may be more likely to benefit. However, children with lower decay risk and well-formed, shallower grooves may not require sealants and can maintain good oral health through brushing and dietary habits alone.

A dental professional is best placed to assess whether sealants may be a useful option for your child.

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When Might Fissure Sealants Be Considered?

Timing is linked to tooth eruption. The most commonly sealed teeth are:

• First permanent molars, which usually emerge from around age six
• Second permanent molars, which usually emerge from around age twelve

Sealing these teeth shortly after they have fully erupted and before decay has had the opportunity to develop is generally considered optimal, where sealants are indicated. Premolars (the teeth between the canines and molars) may occasionally also be considered, depending on individual anatomy and risk.

Your child's dentist will advise on whether and when sealants may be worth discussing, based on regular examinations.

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What Happens During the Application Procedure?

The application of fissure sealants is typically a straightforward, non-invasive procedure that does not require drilling or the removal of tooth structure. Most children find it tolerable, though individual experiences vary.

Here is a general overview of the steps involved:

1. Cleaning — The tooth surface is cleaned to remove any plaque or debris.
2. Conditioning — A mild acidic solution is briefly applied to the surface and then rinsed away. This roughens the enamel slightly, helping the sealant bond securely.
3. Drying — The tooth is carefully dried and kept free of saliva during the procedure.
4. Application — The liquid sealant material is carefully painted into the pits and fissures of the biting surface.
5. Setting — A special curing light is used to harden the sealant quickly.
6. Checking — The dentist or therapist checks the sealed surface and your child's bite to make sure everything feels comfortable and the sealant is correctly positioned.

The procedure is usually completed without local anaesthetic. However, every child is different, and the dental professional will tailor their approach to your child's individual needs and comfort.

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Are Fissure Sealants Safe for Children?

Fissure sealants have been used in dentistry for several decades and are generally considered safe in clinical practice. They are non-invasive and do not require drilling.

Some sealant materials have historically contained small amounts of bisphenol A (BPA) or BPA-releasing compounds. The concentrations involved are very low, and professional dental organisations have noted that current evidence does not suggest a clinically significant risk. If you have concerns about materials, you can ask your child's dentist about the type of sealant they use.

There are some important limitations to acknowledge:

• Sealants can chip, crack or partially detach over time, which may reduce their effectiveness or, in some cases, potentially trap bacteria beneath them if a gap develops
• They require monitoring at routine dental appointments
• They do not guarantee complete protection against decay
• They are not appropriate for teeth that already have decay or existing restorations in the fissures — a clinical assessment will determine suitability

The sealant is placed on the biting surface only and does not affect the overall structure or strength of the tooth.

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How Long Do Fissure Sealants Last?

Fissure sealants can last for several years, but their longevity varies considerably between individuals. Factors that influence how long a sealant remains intact include the child's bite, chewing habits, the specific material used and how well the sealant was bonded at placement.

Because sealants can wear, chip or partially detach, it is important that they are checked at every routine dental examination. If a sealant is found to be partially lost, the dentist can assess whether reapplication or repair is appropriate. A sealant that has completely detached no longer provides protection, and the tooth surface will need reassessment.

Regular dental attendance is therefore an essential part of making sure that any sealants your child has received continue to offer benefit.

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Fissure Sealants Versus Fluoride Varnish: How Do They Compare?

Both fissure sealants and fluoride varnish are recognised preventive options in children's dentistry, but they work in different ways and serve distinct — though potentially complementary — roles.

Neither option is universally superior. A dentist may recommend one, both or neither depending on your child's individual risk profile, dental condition and clinical assessment. They are both most effective when used alongside good oral hygiene and a healthy diet.

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Fissure Sealants and Other Preventive Measures: The Bigger Picture

Fissure sealants are one component of a preventive dental care plan — not a standalone solution. Children's dental health is best supported by a combination of approaches, and sealants should always be considered within this wider context.

Other important preventive measures include:

• Fluoride toothpaste — Brushing teeth twice daily with an age-appropriate fluoride toothpaste is one of the most important things you can do for your child's oral health. NHS guidance recommends that children brush for two minutes, twice a day. The appropriate fluoride concentration and quantity of toothpaste varies by age; your dental team can advise you on what is currently recommended for your child.
• Supervising and assisting brushing — Young children are unlikely to brush effectively on their own. Parents and carers are generally advised to help children with brushing until they are able to do so independently and thoroughly, usually around age seven or eight, though this varies.
• Diet and sugar frequency — It is not just the amount of sugar consumed but how often teeth are exposed to sugar and acidic foods and drinks that matters. Reducing the frequency of sugary snacks and drinks, particularly between meals, can significantly reduce decay risk. Water and milk are better choices between meals.
• Regular dental attendance — Attending dental check-ups as often as your dentist recommends allows for early detection of any problems, monitoring of preventive measures and ongoing, personalised advice.
• Fluoride varnish — As noted above, fluoride varnish applied by a dental professional at regular intervals may be recommended for children considered to be at increased risk of decay.

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A Practical Checklist for Parents

• Book your child's regular dental check-up as advised by their dental team
• Supervise or assist toothbrushing twice a day with age-appropriate fluoride toothpaste
• Encourage spitting out toothpaste rather than rinsing, to retain fluoride benefit (follow your dental team's current guidance)
• Offer water or milk between meals rather than sugary or acidic drinks
• Reduce the frequency — not just the amount — of sugary snacks
• Ask your dentist whether fissure sealants may be worth considering for your child at their next appointment
• Make sure any existing sealants are checked at each visit

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When to Seek Dental Advice

You should contact your dental practice if your child experiences:

• Toothache or persistent dental pain
• Visible holes or dark spots on teeth
• Sensitivity to hot, cold or sweet foods or drinks that does not resolve
• Swelling in the gum or face
• Any change in the appearance of teeth that concerns you

These symptoms should be assessed by a dental professional rather than managed at home. If your child develops facial swelling accompanied by difficulty breathing or swallowing, seek emergency medical attention immediately — this requires urgent assessment.

Fissure sealants are a preventive measure and are not appropriate for treating an existing cavity or infection. A dentist will advise on the right course of action following an examination.

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Frequently Asked Questions

What are fissure sealants for children?

Fissure sealants are thin, protective coatings applied to the biting surfaces of back teeth — particularly molars — to help seal the deep grooves where plaque can accumulate and where decay is more likely to start. They are a preventive treatment, not a filling.

At what age can children have fissure sealants?

There is no single universal age. Sealants are typically considered when the relevant teeth have fully erupted and are accessible. First permanent molars usually emerge from around age six and second permanent molars from around age twelve. A dentist will assess whether sealants are appropriate based on your child's individual teeth and risk profile.

Are fissure sealants safe for children?

Fissure sealants are generally considered safe and have been used in clinical dentistry for many years. The procedure is non-invasive. Some materials have historically contained trace amounts of BPA; if you have concerns about materials, your dentist can discuss the options available. As with all dental treatments, individual suitability should be assessed professionally.

Do fissure sealants hurt?

The application is typically non-invasive and does not require drilling or injections. Most children find the procedure straightforward, though individual experiences vary. Your dental team will do their best to make the appointment comfortable and reassuring for your child.

How long do fissure sealants last?

This varies between individuals. Sealants can remain effective for several years, but they can chip, wear or partially detach over time. This is why they should be checked at every routine dental examination. A dentist can advise on whether a sealant needs repair or reapplication.

Can children still get cavities after having fissure sealants?

Yes. Sealants reduce the risk of decay on the specific sealed surfaces but do not protect all surfaces of all teeth. Decay can still develop on unsealed areas, between teeth or on other teeth entirely. Good oral hygiene, a healthy diet and regular dental attendance remain essential.

Are fissure sealants better than fluoride varnish?

They are different rather than directly comparable. Sealants physically seal grooves in the biting surfaces of back teeth; fluoride varnish strengthens enamel across multiple tooth surfaces. A dentist may recommend one, both or neither, depending on your child's individual needs and risk assessment.

Do all children need fissure sealants?

No. Sealants are not universally recommended for every child. Suitability depends on factors such as the depth of the fissures, individual caries risk, tooth condition and eruption status. A dental professional will assess whether they may be beneficial for your child.

How are fissure sealants checked?

Your child's dentist will visually examine and probe the sealed surfaces at routine check-up appointments to assess whether the sealant remains intact and is still providing protection. If a sealant is partially or fully lost, the dentist will advise on the appropriate next step.

What can parents do to prevent tooth decay in children?

The most important steps include brushing twice daily with age-appropriate fluoride toothpaste, supervising or assisting brushing, reducing the frequency of sugary food and drink, choosing water between meals, and attending regular dental check-ups. Ask your dental team for personalised advice based on your child's needs and risk level.

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In Conclusion

Children and tooth decay prevention is not a single-solution challenge. For some children, fissure sealants for children may form a useful part of a preventive dental plan — particularly for protecting the deep grooves of newly erupted permanent molars. However, they work best when combined with twice-daily brushing using fluoride toothpaste, a diet that limits sugar frequency, and regular professional dental care.

If you are wondering whether fissure sealants might be appropriate for your child, the best starting point is a conversation with your dental team. They can assess your child's individual teeth, risk level and overall dental health to help you make an informed decision together.

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Dental Disclaimer This article provides general educational information about fissure sealants and children's tooth decay prevention. It is not intended as a diagnosis, a personalised treatment plan or a substitute for professional dental advice. Individual circumstances vary, and a qualified dental professional should assess your child's specific needs before any preventive treatment is considered. Reading this article does not establish a clinician–patient relationship.

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Written: 16 October 2026 | Next Review Due: 16 October 2027

This article is marked for clinical review by an appropriately qualified dental professional prior to or at the next scheduled review date.

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