For a variety of reasons, patients with ceramo metal restorations may be treated with fluoride preparation to inhibit caries, for the treatment of hypersensitivity, decalcification and plaque accumulation. Several investigators have reported in vitro corrosion of one or more types of porcelain caused by APF preparations. The purpose of this study was to determine the effect of four different fluoride desensitizer on porcelain restorations

Key words: Fluorides, Topical fluorides, and Fluoride desensitizers.