Recently I noticed that when I am brushing my teeth, it can be a bit hard to open my mouth fully and properly. My jaw seems to open diagonally downwards towards the right instead of straight down. There is also a clacking sound from my jaw.

Not sure if these factors matter, but I grind my teeth sometimes in my sleep. My jaw is considered to be on the smaller side and my teeth is a bit crooked.

Is this normal? What could possibly cause it, will I need to see a dentist to rectify this?

Thank you!