Why do most MMA and Muay Thai fighters not wear Double Mouth Guards on both teeth, both top side and bottom side? They say having a mouthguard on top side with mouth clenched, will prevent damage on bottom. However, it seems like a front teep kick to bottom of head, or a clenched position with knee will cause damage to bottom teeth. Even a slight disruption, pain, or air gasp will make the mouth slightly open, which can cause an issue. It's just amazing that professional fighters do this. If anyone can explain, that would be helpful.
Not sure if UFC professionals just would rather risk bottom teeth damage, because I know double side mouth guards are harder to breathe in also.
I am sparring in Muay Thai, and curious about this.