A renewed interst in conservative cavity preparations has emerged in recent years. In this paper, a substance-saving cavity preparation for the treatment of small, interproximal carious lesions, the rpeventive Class II preparation, is presented. The indications, the cavity preparation, and the obturation are discussed. The combined use of both amalgam and a light-curing pit and fissure sealant is suggested. Clinically, this type of restoration seems to be acceptable. Nevertheless, more clinical experience and in vitro research regarding this type of restoration is needed.