Hello, the tooth cleaning is a technical work, the professional is very strong, need to undergo strict training to be competent. If manual equipment is used, it will take 3-4 hours. It also takes more than an hour to use ultrasonic cleaning machine. "Teeth washing" has become a popular form of oral care in developed countries, and people regularly visit their dental hygienists (one or two a year). Dentists can detect dental disease and treat it in time.
