The tooth surface must be thoroughly cleaned prior to the placement of the sealant. Cleaning can be accomplished using hydrogen peroxide, a toothbrush, a prophy cup or brush, or a prophy jet. Products containing fluoride and/or glycerin are contraindicated and should not be used to clean the tooth. Pumice should not be used to clean pits and fissures as the particles of pumice can prevent the acid etch and the resin from flowing into the fissure. After cleaning, the surface should be rinsed approximately 20 seconds. An explorer should then be used to examine the entire tooth surface for any remaining debris and previously undetected pathology (Figures 7 and 8). If debris remains, the tooth surface should be cleaned again. If pathology is detected, the decision to seal the tooth should be reevaluated.