# The laser used in pit and fissure sealants is:      A. Nd-Yag      B. CO2     C. Tungsten      D. Ultraviolet       # Moderate crowding is considered when space loss is:      A. 3-5 mm     B. 5-7 mm     C. 2-3 mm      D. 10 mm       # The easiest method of brushing in children is:      A. Bass      B. Fone's     C. Modified Bass      D. Scrub