Pit and fissure sealants are available as clear, opaque
or tinted. No product has demonstrated a superior
retention rate but the tinted and opaque FSs have the
advantage of more accurate evaluation by the dentist at
recall [Waggoner and Siegal, 1996]. Rock et al. [1989]
found significant differences in the accuracy with which
three dentists identified a clear and an opaque FSs.