Usually you'll want to use a set of sealed ballistics (or the goggles part of the paintball mask if it's removable) and some sort of low profile teeth protection (eg. a neoprene mask which should reduce the velocity of a BB enough that it doesn't chip teeth, I personally use ballistics with a sykes mask.
That way you can actually use the sights effectively since it's all about the cheek weld. If you're required to have a paintball mask at your field (some paintball fields will not allow otherwise because they want to cover their ass for insurance reasons) then take a look at the "save phace" masks.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE