Ultrasonic cleaning is a very effective method to clean teeth, which can prevent gum bleeding or tooth loosening and help to treat oral diseases such as periodontitis. Moreover, the treatment head of the cleaning machine is smooth, which will not hurt the tooth surface, and there will be no pain during treatment. People with healthy periodontal tissue had better wash it once every six months or once a year. For people with periodontal disease or serious diseases, it is usually washed once every two to three months.