Purchased a 4 pack of oral b precision clean tooth brush heads from 'Brands_Shop" from Amazon UK. All 4 heads fell apart within two weeks, as in each head only lasted two or three days. The back of the head would start to break (see picture) and come apart which would mean it would start catching your lips and inner mouth causing sores. They would become completely useless by the third day or so because it would stop spinning. One head, all the bristles fell out.