In virtually all toothbrushes available on the market, small hooks made of stainless steel fix the bristles in the head. These hooks must not be composted. However the handle can be, just snap the head off and trash first. Bioplastic alternatives, such as the castor oil-based bristles in our RICINE toothbrushes, are based on renewable plant-based oils. However, due to the lengthy degradation periods, they do not fall under the composability criteria for house compost waste.