The Hydrosonic Pro is a powerful yet gentle powered tooth brush giving a professional clean feeling, with every use. With seven different cleaning levels and up to 84,000 wonderfully gentle brush movements a minute. There are three innovative brush heads: power, sensitive and single. The hydrosonic pro can be used with braces, implants and sensitive gums. Designed by dentists, the brush heads have a bend of 10 or 15 degrees, making it easy to clean those hard to reach, difficult areas. Providing more than 60 minutes of brushing from one USB charge. Replace brush heads after three months, may need replacing sooner.