If they place the filmstrip behind your teeth and the machine passes around your face from ear to ear, it probably wouldn't show up. The film might have to be placed on your tongue and exposed from the top of your head.
These are valid points; however, some years ago, I had to have my wisdom teeth removed. They were supposed to take all 4, but could only get three. They tore my mouth up, cut a piece out of my jaw, and did lots of damage. The fourth tooth has been being monitored, and they check it every time, supposedly. They always insist that the tooth is fine, ”no movement”. I had been going to one dentist, but he retired, so I went to another dentist, but then there were insurance issues, so I went to another dentist, but didn't care for them, so I'm on the fourth dentist in 1.5 years. The first thing you have to do when changing dentists is to get x-rays. So, 4 dentists in 1.5 years, and none of them saw this, despite telling me that the tooth was OK.
It's apparently fairly major surgery. I didn't enjoy the last round, and am not looking forward to a repeat.
This is like having your oil changed every 3,000 miles at Dobbs, only to discover at 300,000 miles that it still has the original factory oil filter. Wouldn't you figure they were changing the filter, since you're paying for it, and they said they changed it?