This is completely biodegradable except for the bristles. The bristles are made up of a combination of 70% bamboo charcoal and 30% nylon.
Every toothbrush you have ever used still exists somewhere on the earth's surface- yup, that plastic toothbrush is toxic for the planet. It doesn't decompose. So here is a classy alternate to add to your life. This bamboo toothbrush lasts for 3-4 months, and decomposes back to soil (isn't that awesome? )