ee Dentists use a soft, clay-like material to make a filling for dentist's lamp, a cavity. The filling stays soft under the light of the but it hardens when the dentist shines an ultraviolet flashlight on it. Why does light from the ultraviolet flashlight harden the filling when light from the lamp does not? G Because ultraviolet light carries hardening molecules, but light from the lamp does not. 6 Because ultraviolet light carries energy, and light from the lamp does not 6 Because the filling material can take in energy from ultraviolet light, but not from the light from the lamp. Gg Because ultraviolet light pulls energy out of the filling material, and light from the lamp does not