Preventive sealants cover plaque-retentive areas, occlusal fissures and pits, which are most vulnerable to caries.29,30 However, resin-based sealants involve a washing step to remove the acid etch thoroughly, generating some aerosol. Nevertheless, this risk can be avoided by using low-viscosity or high-viscosity glass-ionomer cement (LVGICS/HVGIC) and excess material can be removed with hand instruments. A Cochrane review found no difference in the preventive effect of resin, LVGIC or HVGIC sealants.30