Mandibles.
The grinding jaws of a insect are called
get life
Ants
They don't have jaws! They have little pincher things.
Platypuses do not have teeth; they have grinding plates in their jaws instead of teeth.
Of course they do. All creatures that chew their food before digestion have jaws and teeth, capable of biting and grinding so it can be swallowed without choking.
grinding, needle, spounge
Mandibles are jaws. Find the mouth and you will find the mandibles.
Usually on it's head. (Ex. Ant, beetle, cockroach)
Adult platypuses do not have teeth. Teeth are not necessary for platypuses, as they "chew" their food by grinding it between horny plates on their upper and lower jaws.
Many would say that a platypus's mouth is like a beak of a duck. It is rather different, with its bill being broader and flatter than a duck's beak. Inside the platypus's mouth are grinding plates, instead of teeth, with which the platypus grinds its food.
You can try buying one of those dental products specifically made for teeth grinding. Or you can just buy an athletic mouthguard, and fit it to your mouth and sleep with that. If the grinding is caused by misalignment of teeth or jaws, then you may want to consult with an orthodontist or oral surgeon to see if braces or possible surgery could fix the problem.