Our Product Is BPA Free. No plastic. Outer packaging is also BPA Free. Only have Natural Bamboo Charcoal bristles. 6 months life. We Only use Natural Bamboo Wood which is Fungus Free. We use Dual layer bristles: inner layer is of PBT for strength so anybody can use it for at least 6 months. Upper layer is Natural Bamboo charcoal or Natural Bamboo fibre infused just to put the product in food grade quality. PBT is an engineered plastic and it uses in many engineering applications due to its characteristics of degradation. It decomposes in soil just in 90-120 days period. And its not harmfull as Nylon & othe plastic bristles are. Basically Dentist recommend Non Nylon bristles or Natural bristles to avoid ulcers problem in early age.