Another word for grin teeth together would be grit.
gnashing
Join.
unitemergeconnectmarryunifycombineblendcouplelinkconsolidate
Combine
repelling
Gnash.
To bite and grind with the teeth
Mastication is the term for chewing. The word is related to the latin word masticare which means to grind the teeth (upper and lower molars) together.
GRIND
"To grind or to strike together" is the meaning of the English word "gnash." The pronunciation of the verb in question -- whose use typically involves gnashing, grinding, striking together teeth -- will be "nash" in the English of the United States of America.
The root word of "chewable" is "chew," which means to crush or grind food with the teeth.
Thankful, appreciative.
Milk teeth.
Another word for Tooth is Tand
Odontophobia.
The word gnashed describes a violent or forceful clenching of the jaws, usually associated with frustration rather than with eating.
Tartar