Dentists recommend replacing your brush every 3 months or sooner if bristles are worn. Easy-to-grip Handle: Silicone Sure-Grip Handle is ergonomically designed to fit easily into your hand for a smoother brushing routine. 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. Cross Bristles: Designed to flex and then straighten, actively penetrating between the teeth to lift and sweep plaque away. Firm & Hard Bristles: 0.25 mm firm bristles for cleaning smoke stain, tartar, coffee stain, tea stain.