These counterfeit brushes! After 3 weeks of use, the head of my brush was downright detached from the rest of the brush, and, in the brush! The OralB acronym present on the brush was cleared on other brushes! But above all, the quality of the bristles of the brush is very bad! The bristles are very hard and texture is different from that of real OralB brushes! Since I've utlisées, my teeth have become VERY sensitive and hurt me! It's a shame that a site like amazon let unscrupulous sellers sell these products! We think buying "healthy, normal and high quality" with confidence and we "have done" anyway!