Teens gotta brush their teeth, and we're happy to help. One billion plastic toothbrushes are thrown away every year in the United States, creating 50 million pounds of waste annually. No thank you. Get a bamboo brush. Use it on your teeth for a month. Use it to clean around the house for a few months. Then bury it in the backyard. Maybe you'll grow a toothbrush tree. Or, maybe it'll just biodegrade.