?Replace Every Three Months? Special bristles fade in color to let you know when it's time to replace the brush head. Dental professionals recommend replacing your brush head every three months. ?Comfortable Use? With an angled neck and contoured bristles that correspond to the natural shape of your teeth, Ofashu replacement toothbrush heads for e-Series Standard toothbrush heads deliver a thorough, comfortable brushing experience. The angled neck provides optimal reach for the bristles, which have soft rounded ends that gently massage your gums and go deep between teeth to remove plaque. ?High-quality DuPont bristles? Ofashu Brush heads use the densely packed DuPont nylon bristles have a better cleaning effect, and the end-round bristles will not harm the gums and teeth. ?Efficient Deep Cleaning? Ofashu replacement heads for e series powerfully removes plaque 7 times higher than manual toothbrushes, better care of your teeth and gums. ?Compatibility for E Series? Ofashu Replacement Brush Heads Compatible with Philips Sonicare All Screw-On handles E-Series Essence, Elite, Xtreme, Advance, Hx7022, Hx5610 Series.