Uniquely designed with ultra soft bristles the Philips Sonicare Sensitive brush head is soft on teeth and gums yet effective on plaque. The ultra soft bristles combined with a new curved bristle field provide less pressure on teeth and gums. The brush head includes reminder bristles to ensure brush head replacement every 3 months as recommended by the American Dental Association. A fresh brush head every 3 months maximizes the effectiveness of Philips’ unique Sonicare technology. 3 standard ultra-soft (bristle) brush heads