Teethes is a verb that refers to the act of a baby or young animal biting or gnawing on something using their teeth. If you need to use a different word to express the same action, you can try using synonyms such as gnaws, chews, nibbles, bites, munches, crunches, or chomps. These words have similar meanings and can be used interchangeably depending on the context. Other related words that are often used in this context include grinds, chatters, and grits. Regardless of the synonym you choose to use, the meaning should remain the same, describing the act of an infant or young animal chewing on something with their teeth.