Keep it dry. Not being made out of impenetrable plastic, bamboo toothbrushes require just a tiny bit more care than a regular toothbrush. Dry it quickly on a towel after each use, and that I store it upright in a clean glass container. This ensures the bamboo stays dry throughout the day, keeping the toothbrush in better condition longer. You may notice that the wood changes color slightly over time as you use it.