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From a dentist and former fighter's POV.....
(misread the original post - thought you had braces on currently)....
The fit should be very snug and tight with proper extension. Otherwise, you won't have enough coverage or too much slack, which will have the mouthguard pop off. That "tightened braces" feeling is what you really want to ensure you have a good fit.
Depending on the style of mouthguard, there may or may not be a space in the front, with teeth contacting only on the back (look at the shock doctor posterior bite pad type). Depending on how it's made, you can impress to have the bottom teeth fit into the mouthguard. Otherwise, you're more likely to bite on the back.
As a fighter - personal preference was ringside's Brainpad or the shockdoctor with the posterior bite pad (both boil 'n bites).
As a dentist - any custom made one that encorporates an upper and lower mold, with a space encorporated in the front for breathing while clenching.
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