d: If you are not satisfied or the product breaks, even if you have used the brush heads, just send message to let us know and we will give you a satisfactory after-sales service!. Indicator bristles: 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.Each brush head has a color-code ring for identification, convenient for family use. 4 Sensitive Replacement Brush Heads: Sensitive electric toothbrush replacement heads provide a superior and excellent full mouth and teeth clean yet are still gentle to the gums and teeth. 4 Efficient Replacement Brush Heads: The efficient replacement brush head uses blue bristles that protrude from the upper and lower parts to deeply remove dental plaque in difficult to reach areas. The bristles in the middle of the brush head can easily remove stains on the tooth surface, increg cleaning efficiency by three times compared to a regular toothbrush head. 4 Floss Replacement Brush Heads: Advanced Pulse bristles reach deep between teeth for superior plaque removal. Oval brush heads can increase the area for tooth cleaning, achieving a comprehensive cleaning effect. 4 Precision Replacement Brush Heads: The bristles of the precision replacement brush head can wrap the teeth in all directions, and perform Tooth-by-Tooth cleaning. The blue bristles on the periphery can deeply clean the gaps between teeth. Healthy and reliable: End-Rounded bristles with gum and enamel protective function, the bristles 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 deform and more durable. Effective cleaning: Qitizu Brand brush heads, 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.