Uhm... Most of my life I went to a doctor that simply checkeed my teeth "physically". Then a couple of years back she send me to get x-ray to her's son place "just in case". And then she retired and I moved to him. And while he does x-ray more often it's mostly as a fallback when he checks my mouth and has some doubt/x-ray was done more than 2 years ago.. but again - it's not very expensive - like $25 :D