Unfortunately they are not 100% recyclable and not 100% biodegradable. Note that they never mention toothbrushes as "100%" anything, and it's all because of the bristles. The bristles are still plastic (they are made of BPA-free nylon). So if you unfortunately throw it in the trash, it probably won't get recycled. If you don't snap off the bristle heads they are 100% recyclable/biodegradable as bamboo is 100% recyclable. 3 stars because it's still better than a plastic toothbrush and the bristles feel nice. But again, the marketing of this product is a bit misleading. Be a savvy consumer when buying "green" products and educate yourself!
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