When protecting and cleaning the denture, because the treatment is different, the protection and cleaning methods taken are also different, as follows: a. movable denture restoration: the denture should be removed promptly after daily meals, contain mouthwash and rinse the denture with clean water. Before going to bed, remove the denture and clean the surface of the denture with a toothbrush dipped in a small amount of toothpaste and soak the denture in water to prevent the fracture of the resin. Second, fixed denture restoration: eat less hard objects to avoid fracture of the crown. The electric toothbrush should be adjusted to a low setting to reduce the stimulation of the crown when applied for cleaning. In ultrasonic cleaning, the working tip should avoid porcelain or all-ceramic crowns to prevent chipping. Third, the implant prosthesis: to apply flush, dental floss, etc. to thoroughly clean the adjacent surface of the crown to reduce the retention of plaque and avoid the occurrence of peri-implant tissue inflammation.