Dentists recommend replacing your toothbrush every 3-4 months. replacement toothbrush heads feature Indicator bristles that fade halfway to help remind you when to replace your toothbrush head so you maintain a superior clean vs. a regular manual toothbrush. Value Pack:4 Sensitive Replacement Brush Heads,4 Angled Bristles for a Deep Clean,4Floss Replacement Brush Heads,4Precision Replacement Brush Heads,There is always one of the 4 brush heads to meet your needs. Floss Replacement Brush Heads: This 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 toothbrush. Durable bristles: In order to ensure the durability of the brush, we adopt high-end bristle implantation technology, which makes the bristles more durable and not easy to fall off. You will get a premium brushing experience. End-rounded bristles: For our bristles, we have used the most advanced top-rounded technology. The protruding bristles on the upper, middle and lower parts of the brush undergo the first rounding process; then the concave part is rounded for the second time to ensure that each bunch of bristles meet the standard. The multi-process is only to better protect your teeth and oral health. End-Rounded bristles With gum and enamel protective function, The bristle tips are rounded several times to ensure that each bristle is gentle to gum. These end-rounded gum health toothbrush heads are the trusted choice for gentle, gum-health and effective brushing. US DuPont bristles. Made with DuPont bristles, which are the highest quality in the industry, with better elasticity and toughness, not easy to deformed and more durable. Each can last for 3 months . Even if brush teeth more than twice a day or with more force, it can still last for 2 months. the bristles with bacterial protective function, which can prevent bacterial growth on the brush. Also with strong cleaning function, which can removes up to 5x more dental plaque along the gum line than a traditional manual toothbrush. Toothbrush Head Compatible with oral b Pro series, Smart series, Genius series, Kids series professional care series, oral-b triumph series, oral b trizone series, oral-b advancepower series, oral b vitality precision clean, oral b vitality sensitive, oral b vitality white + clean, oral-b vitality dual clean, except for Oral b Pulsonic and IO.