Fissure sealants are one of the most effective and underused tools in children’s dentistry. They’re quick, painless, and the evidence behind them is solid — yet many parents have never been told they exist until decay has already started.
If you’re thinking about protecting your child’s back teeth before problems develop, our page on children’s dentistry in West Byfleet gives a fuller picture of what we offer at Coniston Dental Practice.
What Are Fissure Sealants?
The biting surfaces of molars and premolars are covered in tiny grooves and pits — fissures — that are almost impossible to clean thoroughly with a toothbrush. Food and bacteria settle into them, and because the enamel in those grooves is thinner, decay can take hold quickly. Fissure sealants are a thin plastic-resin coating applied directly to those surfaces, sealing the grooves and creating a smooth, cleansable surface.
They don’t drill, they don’t require anaesthetic, and the whole process takes around fifteen to thirty minutes per visit. Fissure sealants don’t replace fluoride or good oral hygiene. They work alongside both, targeting the one surface where a brush simply can’t reach.
Which Teeth Benefit Most?
The first permanent molars typically erupt around age six, and the second permanent molars follow around age twelve. Both are prime candidates for sealants, ideally applied shortly after they emerge — before any decay has had the chance to start. Premolars, which arrive between roughly ten and twelve years old, can also benefit, particularly in children with deeper-than-average fissures.
Baby molars can also be sealed in some cases, especially where a child has a high sugar diet or has already shown signs of decay elsewhere. In our experience, catching the first permanent molars early — ideally within six to twelve months of eruption — gives the best long-term result.
Some children’s fissures are naturally shallow and self-cleansing. Others have deep, steeply-sided grooves that trap debris no matter how carefully the child brushes. We assess this at each check-up visit and recommend sealants where the anatomy warrants it, not as a blanket treatment.
The Application Process
There’s nothing painful about the procedure. The tooth is cleaned and dried, a mild acid gel is applied briefly to roughen the enamel surface — this improves adhesion — and then rinsed away. The sealant material is painted on in liquid form and cured with a blue light in a matter of seconds. Your child will feel nothing beyond the presence of the applicator and the light.
Some children find the suction device or the rubber dam used to keep the area dry slightly uncomfortable, but the procedure doesn’t involve needles, drilling, or anything that causes pain. Most children are entirely unconcerned once they realise that.
The sealant sets hard and the child can eat and drink normally straight afterwards.
How Long Do Sealants Last?
Sealants are durable but not permanent. Under normal conditions, they last somewhere between five and ten years, with many remaining intact well into adolescence if applied at the right age. They do need to be checked at each routine appointment, as they can chip or wear thin over time.
If a sealant lifts or is partially lost, it can usually be topped up without any additional preparation — the tooth simply needs to be dry and clean. That said, a lifting sealant that goes unnoticed for a long period can trap decay beneath it, which is one reason why routine check-ups matter even when nothing seems wrong.
| Age | Tooth Type Erupting | Sealant Recommendation | Notes |
|---|---|---|---|
| 5–7 years | First permanent molars | High priority | Seal within 6–12 months of full eruption |
| 10–12 years | Premolars | Moderate — assess fissure depth | Recommended where fissures are deep |
| 11–13 years | Second permanent molars | High priority | Same approach as first molars |
| Any age | Baby molars (primary) | Selective — high-risk cases | Used where decay risk is elevated |
| Ongoing | All sealed teeth | Monitor at each check-up | Top up or replace if worn or chipped |
Sealed vs Unsealed: What the Evidence Shows
The research on fissure sealants is consistent. Studies consistently show that sealing the occlusal surfaces of molars significantly reduces the incidence of pit-and-fissure decay over a five-year period compared with leaving them unsealed. The NHS guidance on children’s teeth recognises fissure sealants as a recommended preventive treatment.
Most decay in children’s permanent teeth starts in the fissures, not on the smooth surfaces between teeth. That’s the gap that sealants address directly.
What Parents Can Do Alongside Sealants
Sealants cover the biting surfaces, but they don’t protect the sides of teeth or the spaces between them. Those areas still rely on fluoride toothpaste, twice-daily brushing, and — once all the adult teeth are in — interdental cleaning.
The pattern we notice is that children who get sealants at the right age and maintain decent brushing habits reach adulthood with far fewer restorations than those who don’t. And/but that outcome isn’t guaranteed — diet, saliva chemistry, and consistency of care all play a part.
Reducing the frequency of sugary snacks and drinks matters as much as anything. It’s not just about the quantity of sugar, it’s how often teeth are exposed to it throughout the day.
If you’d like to discuss whether fissure sealants are appropriate for your child, Coniston Dental Practice is accepting new young patients in West Byfleet and the wider Woking area. You can reach us on 01932 343675 to book a check-up and prevention assessment.
