Re: How does your mouthguard fit ?
What is the problem? Just that your friend's one fits differently?
I used to have that mouthguard and found that it used to cut my gums a lot, I ended up investing in a fitted mouthguard from the dentist which is fantastic.
If you have the money i'd suggest buying a fitted mouthguard, if not I think you will just have to accept the fact that a boil and bite mouthguard will never be 100% perfect