High-quality generic Pro White and Cross Action toothbrush replacement heads for Oral B electric: - Nylon Bristles with multiple rubber bristles to gently cleanse gums imitating a flossing effect - Features Micropulse bristles that penetrate deep between teeth to sweep away dental plaque - Lasts up to three months - Bristles' colour fades indicating replacement due Fit for the following models of Oral B electric toothbrushes only: - Oral B Triumph Professional Care-9000 series - Oral B Professional Care 5000/ 6000 /7000/8000 - Oral B Vitality Precision Clean, SensitiveClean, White Clean - Oral B Dual Clean - Oral B Advance Power 400/900 - Not compatible with Philips electric toothbrushes