Drying of etched surface of teeth

After rinsing the tooth's surface should be dried with compressed air for about 15 seconds and isolated from saliva by dental dam which constitutes a simple and effective method of protecting operative field against infection by microorganisms from saliva. This is necessary because any water remaining after rinsing as well as organic impurities from saliva left on the etched surface, impair sealant's penetration into microfissures, thus decreasing the strength of bonding between sealant and enamel. In case of contact with saliva, etching should be repeated for 15 seconds with subsequent rinsing and drying of the tooth. It should be checked with special attention that the compressed air is not polluted by water or oil.

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