Soft Replacement Heads. Used For Source Toothbrush. Made in USA. BPA Free. Gum massaging bristlesThe unique curved bristle-bed ensures our plush bristles clean and massage the gum rather than aggravating them. Choose your bristle type! Our Super Soft Flossing bristles are tapered to get closer to your gum line while our Soft and Medium bristles are end-rounded for a pillow-soft clean. Pair these replacement heads with our Big Brush, Source Brush, or Tour Travel Brush. Longer neck for better reachA long, thin neck makes cleaning tricky-to-reach spots much easier all the way to the very last molar. Premium, eco-friendly bristlesThe soft bristles are made from vegetable-based nylon to reduce our dependence on fossil fuels. The bristles are arranged in an elegant fanned shape, designed to gently yet thoroughly clean and invigorate the entire mouth. Dentist Recommended