All food except corn and nuts. By the release of saliva and the breaking of the food into smaller pieces by the teeth
Yes and no, while it is much better to take out your piercings during X-ray it won’t harm you if you don’t. After doing some reading from what I gather is it just creates a black image blocking what they could be looking for. All you really need to remove is the piercings that are in the way.
Pretty fast. Or maybe slow.
