When you saw the resulting x-ray pictures, you will understood what the problem was.Yours earrings all created a nice black image in the shape of the jewelry that blocks the view of what they were trying to actually see.
Your ears and nostrils are in line with your jaw. Lip and tongue jewelry would definitely obstruct the view of your teeth, gums, etc. So, the reason they ask you to remove the jewelry is so that they don't waste film getting pictures that are useless to them. Now when I go in for x-rays, I remove the ones I know will be in the way.