Virtuous Toothbrushes. Eventually every bit of petroleum-based plastic in our homes will need to be replaced with something more sustainable. Dylan Regan from Dublin has begun the process with a bamboo toothbrush with bristles infused with charcoal to help fight plaque. For every VirtueBrush sold, three trees are planted. Bamboo is a renewable resource that matures in three years compared to over a century for oak. It’s rapid growth (up to three feet a day for some species) makes for impressive carbon sequestration, about 70 per cent more than an acre of hardwoods.