 [ Symptoms ] how do lasers work in dentistry [ Disease ] all lasers work by delivering energy in the form of light when used for surgical and dental procedures the laser acts as a cutting instrument or a vaporizer of tissue that it comes in contact with when used for curing a filling the laser helps to strengthen the bond between the filling and the tooth when used in teeth whitening procedures the laser acts as a heat source and enhances the effect of tooth beaching agents