This study concerns the prevention of dental caries by sealing pits and fissures of permanent molars with a photopolymerizable resin. It must compare these three techniques Microdentisty (air abrasion, abrasion and sound using small cutters) usually used to prepare micro cavities in the enamel and / or the outer third of the dentin. These three commonly used techniques have never been compared by retaining as endpoint retention of sealant. These techniques are painless and do not require local anesthesia.

Inclusion Criteria:

• Affiliated with the Social Security
• Attendance at inspections
• Subject to high individual risk of caries
• Subjects with at least two pairs of molars and contralateral counterparts with the initial lesions of enamel (pits and fissures colored) or suspected of dentine caries (not highlighted by two clinical and radiographic examination usual)

Exclusion Criteria:

• Molar inaccessible, closed, sealed, or decayed (reaching the dentine