It looks like a rapid chewing motion but you won’t find anything inside your cat’s mouth. Cats will also make a high-pitched, almost chirping-like sound when they do it.
Dental disease is a big catch-all term that includes a variety of minor and major conditions, all of which can cause unusual mouth movements if left untreated for too long.
It’s commonly compared to cold in humans, just like a cold causes congestion, sore throats, sneezing, and more. It can also vary significantly in severity.