1. Gather the necessary materials. To properly fit your mouthguard, you'll need: your mouthguard scissors enough boiling water to submerge the mouthguard in a ... 2. Trim the mouthguard for length. You may need to trim the ends to make sure your mouthguard fits comfortably and doesn't irritate the back of your mouth. Put ... 3. Submerge the mouthguard in boiling water. You need enough boiling water to submerge the mouthguard in it for between 30 and 60 seconds. Start a small pot of ...
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