If a potential dentist won’t accept x-rays from another dentist, especially when your x-rays are over a year old, see another dentist. Seriously, x-rays should not be a way for them to make money. Examinations from one dentist should be good enough for another to work with. This should be a red flag that this dentist only cares about making money. And why isn’t more research done to see why some people don’t get cavities? There must be some genetic or biological reason, why some are less prone.