You call it...
An external mouth guard.
An external mouth guard is commonly referred to as a "mouthguard" or "mouth protector." It is designed to fit over the teeth and gums to protect against injury during sports or other activities. Mouthguards can be custom-fitted by a dentist or purchased as generic, boil-and-bite options. They help prevent dental injuries and reduce the risk of concussions.
buy a new mouth guard
You take them out because if you keep them in and have a mouth guard in the denture cuts your mouth all up.
no
teeth
arthur wood
wallmart
Mouth Piece, its used as a guard for your teeth.
a mouth guard
The mouth
A mouth.
A mouth.