KHBD Replacement toothbrush heads are compatible with all electric toothbrush handles, except for Oral-B Sonic,Pulsonic and iO seriesPack Of 16 Replacement Toothbrush Head for Electric Toothbrush- Includes 4 PC Clean, 4 Floss Clean, 4 Cross Clean & 4 White Clean.Crossclean has angled bristles to encompass each tooth for a thorough, complete clean, Increase the polished area by 300%, so the whitening effect can be achieved faster,with soft bristles to give you the gentlest brushing experience while reducing inflammation, reversing gingivitis, and improving gum health.Flossclean has Pulse Bristles that penetrate deep between teeth to sweep away dental plaque for a floss-like clean, is designed for cleaning and more dental plaque removal than a regular manual toothbrushPrecision Replacement Electric Toothbrush Head - For a Tooth-by-Tooth Clean, Soft bristles for a comfortable clean, perfect for beginners, for superior plaque removal.Sensitive Replacement Brush Heads: Extra soft bristles for sensitive gums provide a superior& gentle cleans. Ideal for those who want to brush their teeth gently but effectively and people with sensitive gums.KHBD Brand brush heads, the bristles with bacterial protective function, which can prevent bacterial growth on the brush.Dentists recommend changing the refill every 3-4 months.