What Are Fissure Sealants?
The chewing surfaces of back teeth (molars and premolars) are covered in deep pits and grooves called fissures. These grooves are so narrow that toothbrush bristles cannot reach the bottom to clean them — making them a prime location for cavity-causing bacteria to accumulate undisturbed.
A fissure sealant is a thin plastic coating painted onto these grooves that seals them off — filling the pits and creating a smooth, easy-to-clean surface. Bacteria can no longer hide in the grooves, and the risk of cavities in those areas is dramatically reduced.
The procedure is completely painless and requires no drilling. The sealant is applied in liquid form, flows into the grooves, and is hardened with a curing light in seconds. It takes about 20 minutes per tooth and requires no anaesthesia. It is one of the simplest yet most impactful preventive treatments available.
Who Should Get Fissure Sealants?
Children aged 6–14 when permanent molars erupt
Adults with deep grooves and no existing fillings
Patients with history of multiple cavities
Patients with difficulty brushing effectively
Children with high sugar diet
Patients with dry mouth (reduced saliva protection)
Anyone wanting maximum cavity prevention
Teeth with deep anatomical grooves on X-ray
The most cost-effective dental treatment there is
A fissure sealant costs a fraction of a filling. A filling costs a fraction of a root canal. A root canal costs a fraction of an extraction and implant. Preventing the first problem in this chain is overwhelmingly the most economical choice — and fissure sealants are the most evidence-based way to prevent cavities in back teeth. The investment in sealants pays for itself many times over in avoided treatment costs.
The Fissure Sealant Process
1
Tooth Assessment
The tooth is examined to confirm the grooves are cavity-free and suitable for sealing. Sealants are only placed on sound, unfilled tooth structure. If there is any early decay in the groove, a very small preventive resin restoration may be placed instead.
2
Cleaning & Drying
The tooth surface is cleaned and thoroughly dried. Moisture control is critical — sealants do not adhere well to wet surfaces. Cotton rolls or a dental dam keep the tooth dry during application.
3
Etching
A mild acid etching gel is applied briefly to the chewing surface, then rinsed. This creates a slightly rough surface at a microscopic level, improving the mechanical bond of the sealant to the enamel.
4
Sealant Application
The liquid sealant is carefully painted into all the pits and fissures, ensuring complete flow into every groove. It is then hardened immediately with a blue curing light — the entire hardening takes about 30 seconds.
5
Bite Check
The bite is checked to ensure the sealant is not too thick. Any high spots are adjusted. The tooth is immediately functional — patients can eat normally straight after the appointment.
Frequently Asked Questions
At what age should children get fissure sealants?
The ideal time is shortly after the permanent molars erupt — typically the first permanent molars around age 6–7 and the second permanent molars around age 11–13. Applying sealants as soon as the teeth are fully erupted and before cavities start gives maximum protection. However, adults with deep unfilled grooves also benefit from sealants at any age.
Do fissure sealants hurt?
No — fissure sealants are completely painless. There is no drilling, no injections, and no removal of tooth structure. The etching gel may cause a mild, brief sensation on sensitive gums if it contacts them, but the tooth itself feels nothing. The procedure is well-tolerated even by anxious young children.
How long do fissure sealants last?
Sealants typically last 5–10 years. They are checked at every routine dental visit — if a sealant has chipped or worn away, it can be easily reapplied. Even partially intact sealants provide significant protection compared to no sealant. Regular dental check-ups are important to monitor sealant integrity.
Can sealants be placed over existing cavities?
No — sealants are only placed on cavity-free tooth surfaces. If a cavity is present in the groove, even a very small one, it must be cleaned and filled first. Sealing over decay traps bacteria inside the tooth and accelerates decay. This is why proper examination before sealant placement is essential — cutting corners here causes harm rather than prevention.
Are sealants safe?
Yes — fissure sealants have an excellent safety record supported by decades of research. Modern sealants are made from BPA-free resin. The amount of material used is minimal. The protective benefit against cavities — which require drilling, filling, and potential future root canals — vastly outweighs any theoretical concern. Major dental health organisations worldwide recommend fissure sealants as standard preventive care for children.
Do sealants protect all surfaces of the tooth?
Sealants protect the chewing (occlusal) surface of back teeth — the most cavity-prone area for children and teenagers. They do not protect the sides of teeth between adjacent teeth, which are protected by flossing. A comprehensive prevention programme combining sealants, fluoride, regular scaling, and daily flossing provides the most complete protection.