We had a guy chip a tooth yesterday at an outdoor game. That's convincing me to start wearing mine. I've been wearing a shemagh and I think it would do fine, but I'm not going to take any chances anymore.
Lots of guys cut them down in size and attach them to the bottom of their goggles via zip ties or other means. This way, they sort of float off your face and you cut them to a size that protects your teeth well but also let's you have most of your other facial and neck movements.