Clicking/crunchy/poppy sounds or high pitched continuous squealing sound?

The former are often related to the tube that connects your mouth to your ear…yeah, seriously, there is one and it’s called your eustachian tube.

The latter is often nerve related and may be present continually although quieter even without jaw movement.

Assuming it’s the former, the next question is why. Answers to question why come in 2 flavors: 1) shit that matters (uncommon) and 2) shit that usually doesn’t matter. 1) would be stuff like malignancy at the anterior opening of the tube and 2) would be inflammation of the tube from infection. Most such infections require no treatment.

That said, I ain’t yo doc, use common sense and seek medical care if you deem it necessary.