The benefit of bamboo brushes is that bamboo is sustainable and means less plastic hanging out in landfills and oceans for centuries to come. I think most people would happily switch to bamboo -- once you discover how pleasant a wooden handle feels compared to a plastic one, the switch is easy. But most people don't know bamboo toothbrushes exist. So I've been giving them to my family and to our houseguests, and the response is always positive. My sisters now buy bamboo tooth brushes for their own families. Word of mouth indeed!