My doctor does me dental x-ray every 6 month is it safe to do this every 6 month could i be at risk for future problem could this cause cancer?

Good for you: You are seeing your Dentist twice yearly for examination/cleaning as recommended. 2-4 bite-wing (cavity/bone level x-rays provide you with less radiation than a couple of hours in the sun, and provides the Dentist with invaluable information. If you have a recurrent decay problem, or a bone level problem, or you are diabetic, this is not too much exposure. Talk to your Dentist about your concerns.

Dental X-rays : Today at digital world most dental X-rays are done digitally. Prescribing X-rays are based on patient individual need. If there is a presence of multiple restorations or gum disease X-rays will be likely more frequently prescribed. Ask the doctor the reasoning why. Are the same films taken every time or different areas are screened? It all matters.