Description Bamboo & Charcoal bristles – recyclable / partially biodegradable Natural Bamboo handle – completely biodegradable and compostable. WHY BAMBOO? Bamboo is the worlds fastest naturally renewing resource which is also inherently anti-microbial, anti-fungal and anti-bacterial. WHY THE PACK OF 4? Brushes should be replaced regularly (every month or two) or after an illness. For a family of 4, this is one brush each. For a single person, this pack lasts 4- 8 months (depending on how regularly you change brushes)! This means you can really start paying attention to your oral health without the worry of contaminating the environment.