Too soft - Grew mildew/mold
I've tried a few bamboo toothbrushes and these have been the worst. The bristles are so soft I could barely feel them and they fell out. The handle splintered. Then they quickly grew mildew/mold (never an issue with other bamboo brushes I've used in the exact same conditions) and were all promptly thrown in the trash.
Rating: 1 stars