Review (4/5): Kinda chunky
TL;DR : Don't buy if you have a small mouth.
I spent a lot of time deciding which to buy. These are great, but man is the brush head chunky. I have a big mouth and it's still a little annoying. It's honestly not that bad for me, and I'll survive all four toothbrushes. But I'll probably buy a different style next time. Quality wise...I don't think there's charcoal in these bristles. lol. They still work well and they are a medium thickness. The packaging is all recyclable so that's cool. No problem with bristles falling out thus far. (two weeks in) :)