You call it... An external mouth guard.
buy a new mouth guard
You can kill mold with bleach. You should wear a mask so the mold spores don't get into your nose or mouth.
a mouth
You take them out because if you keep them in and have a mouth guard in the denture cuts your mouth all up.
teeth
no
To boil a mouthguard, place it in a pot of boiling water for 30-60 seconds. Remove the mouthguard with tongs and let it cool slightly before shaping it to fit your mouth. Be careful not to leave it in the boiling water for too long to prevent damage.
Sunlight can stunt a mold's growth. Mold grows best in dark, damp, warm places. This is why it is easily possible to get a yeast infection in your mouth/genitalia
arthur wood
wallmart
To mold a sports mouth peice you have to boil it in a pot of hot water... After that you stick it in your mouth and clampdown and keep it clamped for awhile... Take it it out and let it cool down.. Then there you go.