It's easy to maintain a cleaner toothbrush! This monthly reminder allows you to circle the month to replace the head. Bristle protection lasts for 30 days of use. Simply change each brush head every 30 days to maintain continual bristle protection. Interdental Bristle Trim effectively cleans between teeth. Dome Trim raised center bristle design has been clinically proven to clean below the gumline and reduce gum diesease. The first Replaceable Head Toothbrush with Antibacterial Bristles. Stays cleaner after use than ordinary toothbrushes. Now it's easy, convenient, and economical to change to a fresh toothbrush month after month. Bristles have a patented Chlorhexidine antibacterial coating for bristle protection. Bacterial growth that may affect the bristles is inhibited. The antibacterial bristles do not protect you against disease. As always, rinse your toothbrush.