One word: Biodegradable.
When you find a simple, convenient way to be kinder to the environment, grab it - literally. These bamboo toothbrushes are a great alternative to disposable plastic ones with a biodegradable handle. Simply pluck and recycle the bristles and compost the handle when you're finished using it.
Available in charcoal-infused (known for it's whitening properties) or natural bristles.