Here are some tips.
Guard odor is very common.
Tip #1: simply brushing your guard after every meal just as you would your teeth. The morning is crucial as it will help get rid of your morning breath.
Tip #2: floss your teeth on a daily basis. Will smell terrible food sits in ur guard.
Tip #3: not only is rinsing with an antimicrobial mouth wash very important for your mouth, it can also act as an odor killer.