Now this never really bothered me in the past but on hindsight I stick this thing in my mouth just like food so it would be good to know what its composed of. What really got me though is seeing toothbrushes that say whitening or antimicrobial which begs the question. Why is this whitening or antimicrobial? What the heck is in it that is doing this action??? Now that I think of it this might be more than mildly infuriating.
The American Dental Association is probably who you’re looking for. The fda and usda don’t regulate toothbrushes in that sense so you’re not really goi g to get a legally required disclosure like you do with say tooth paste. The ADA will have a seal or mark they put on products they deem safe via testing.
https://www.ada.org/resources/research/science/ada-seal-of-acceptance