... (bacteria and moulds) during normal use.The bristles1. The bristles are made from 100% biodegradable soft and medium bristle, nylon4, bamboo ... bacteria and moulds) during normal use.The bristles1. The bristles are made from 100% biodegradable soft and medium bristle, nylon4, bamboo ... into soil, without pollution.2. To answer the main question, HOW LONG DOES IT LAST? - We test drove a toothbrush for over ...