What is the best time to apply sealants?

• A. Immediately after eruption
• B. Several years after eruption
• C. During eruption
• D. Before eruption begins

Answer: (A)

Sealants are most effective when placed on a tooth soon after it erupts. At this stage the pits and fissures are newly formed, relatively plaque-free, and the enamel surface is accessible for a clean, dry field. This allows optimal etching and strong micromechanical bonding of the resin to enamel, giving the sealant the best retention and effectiveness in preventing caries on the commonly affected surfaces.

If you wait several years, biofilm and calculus can accumulate in the fissures, isolation becomes harder, and bond strength can decrease, reducing sealant longevity. Sealing during eruption isn’t ideal because the tooth is partly out and isolation is difficult; sealing before eruption isn’t possible because the tooth surface isn’t exposed yet.