The DENTTABS Bamboo Brush is made of bamboo; the bristles are made of nylon 6. 

They gently brush teeth and gums, to give the wonderful feel of polished teeth! 
 
 
And another tip: 
The real reason to replace the toothbrush is due to germs contamination. So if you do not mechanically break your toothbrush, you can extend the useful life of your toothbrush by occasionally heating it above 60 ° C (eg also in the dishwasher). We have had the best experience!