Gagging is affected by the cut of the mouthguard. If your mouthguard is too high or too long, it causes unwanted material where it isn’t needed. In order to keep from gagging, mouthguards must avoid the soft palate — the fleshy, flexible part toward the back of the roof of the mouth. That means your mouthguard’s material should stop between the end of the first molar and midway through the second. The material in the soft palate area doesn’t provide any protection from any injury. Just discomfort.
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