Get it to the correct length
It can sometimes be an issue that if mouthguards stretch too far, they can irritate the back of your mouth.As a mouthguard is mainly used to protect your vulnerable front teeth, not the molars, some wiggle room at the back is fine. While certain athletes like to have a shorter guard that just covers the front teeth, others feel more comfortable having one that can go as far as covering the first molars. Before you start moulding your mouthguard, try putting it on your mouth, and if it feels like it's poking you, it may need some altering. You can do this by carefully trimming the mouthguard using a pair of scissors. Obviously don’t go overboard, just make sure it’s the right length for you.