BPA-free nylon bristles are used to manufacture our eco-friendly toothbrush bristles. We are currently working on switching to Nylon-4 bristles which are biodegradable.
There are pros and cons with Nylon bristles. Durable, non-toxic and vegan are the reasons why prefer them to animal based bristles like pigs' hair. Remember to snap off and remove the head of you toothbrush before composting the wooden handle.