up and down...
If you move your mouth from side-to-side, when you are chewing fun, it promotes the chance of you biting your mouth. Though if you don't, then it helps train you to keep your mouth chewing in one place. So it does help you not bite your mouth if you don't chew randomly or up-and-down.
chewing like a cow
in the pig mouth
enzymes and chewing are part of your mouth
describe their mouth and teeth
Chewing / biting
mouth
Yes, chewing with your mouth open is very poor etiquette. A person should always chew with their mouth closed; swallow the food and then they can open their mouth.
Mouth sores are caused by Chewing Tobacco.
to have good mouth musils while chewing
make you less eating because you are chewing gum in your mouth
Mouth Cancer.