With over 10,000+ silky bristles per brush, these toothbrushes are super gentle on dogs sensitive mouths and gums. Made with a eco friendly wheat-straw composite biodegradable handle. No more bamboo splinters! PBT polymer material bristles (80 Micron wire diameter) get into grooves other bristles can't. PBT bristles have excellent moisture resistance which keeps bacteria from growing. Comes with a reusable & breathable container to keeps your brush clean and dry.