Bamboo is a natural material but with proper care, your bamboo toothbrush will last just as long as a conventional plastic toothbrush.
Bamboo keeps best dry, so dry it lightly after use and store it upright in a dry area.
The color of the bamboo will change over time while using, but it is natural and won't affect your toothbrushing experience.
Remove the bristles with a pair of pliers, so you are left with only the bamboo handle. The bamboo handle can be added to a private or commercial compost bin or shoved in the ground and will safely return to the soil within 6 months.
You can also choose to upcycle the bamboo handle! Try using it as a garden marker for vegetables or flowers.