Well without seeing it we will all be guessing.

If it lost a tooth it will be fine. They regrow. But I doubt that is what it is.

My guess it needs to realign its jaw. Not to be concerned about either.

The worse thing I can think is if it smacked its face on the side of the cage and broke a jaw bone. Not a common break and I doubt this happened. Just spotballing.

It will probably give a good yawn and jaw adjustment and be back to normal.