Extra Firm Hard Bristles 030 mm extra firm bristles for cleaning smoke stain tartar coffee stain tea stain Cross Bristles Designed to flex and then straighten actively penetrating between the teeth to lift and sweep plaque away Textured Tongue Cleaner Located on the back of the toothbrush and helps remove food debris and plaque on your tongue to leave your mouth feeling fresh Easytogrip Handle Silicone SureGrip Handle is ergonomically designed to fit easily into your hand for a smoother brushing routine Dentists recommend replacing your brush every 3 months or sooner if bristles are worn