This is the only mouthguard I've used so I don't know if they all fit or not. I have a big mouth and I feel like it stays very far in the front of my mouth. It also rubs the inside of my mouth and gums so hard they get that tender feeling like eating too many chips, but all over the mouth, not just the roof of the mouth. It also falls at night. However, this is true; Quit grinding me while he's inside, this brings some relief. I would recommend people try this as everyone's mouth is different and if you have a 'better' shaped mouth to stay in you might find some relief!
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