I've been airsofting 15 months - I've personally seen 1 tooth snapped off clean at the gum and 2 have not insignificant corners taken off. I have a permanent BB scar on that soft skin where cheek joins eye socket. Hits to the cheek sting, but they don't usually scar. Hitsdirectly to the teeth often break them.
There are 2 types of mesh: woven wire and perforated sheet. Perforated sheet comes in 2 broad categories also: wide circular holes with substantial dividers between and small circular holes through much finer sheet.
Woven wire makes for the least visual interference: it just disappears from your view after a short while wearing it. Unfortunately the standard woven mesh in goggles is not impervious to damage, although it does not give way to anything you could be hit with in one go, it's just that the wires do deform so over time there must become a steadily increasing risk that one could fail. The mesh in full face masks, like fencing masks with camo paint and cloth patches, is much more solid however it does create the slightest shadows over your visual field.