I agree with Tyler, those mask are great and mesh mask are very cumbersome and uncomfortable. I just have trouble using my sights with them. If you want to protect your teeth and have a low profile, light, and breathable lower mask. Get one of these: http://www.airsoftgi.com/advanced_searc ... ne&x=0&y=0
I use one of these under my balaclava and, even though it still hurts when you get shot, it protects you from any kind of bb related mouth injury. I have been shot in the teeth and lips multiple times with this on with no kind of damage done. They are also fairly cheap.
They also make them in just the lower portion of the mask, but they don't sell them on ASGI.