If the fit's not quite right, you can remold your SISU Mouthguard up to 20 times without losing its protective properties. Here's how:
To remold your SISU Mouthguard, slip it back into hot water (160 degrees Fahrenheit) to restart the fitting process. You can also choose to remold a specific part of your mouth guard by dipping just the problem section into hot water and refitting that portion of the guard.
If your previous fit was too snug, try remolding using less suction.