A HUMAN NECESSITIES
A61 MEDICAL OR VETERINARY SCIENCE; HYGIENE
A61C DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
A61C17/00 Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
A61C17/16 Power-driven cleaning or polishing devices