Standard practice here in the US is a full mouth x-ray about once every 12-18 months, because that's what insurance will pay for. (and my dentist is the same w

Standard practice here in the US is a full mouth x-ray about once every 12-18 months, because that's what insurance will pay for. (and my dentist is the same way -- he'll sit down with an x-ray and sometimes photos as well, and go over "OK, this might be the beginning of a cavity, or it might just be a stain from drinking tea/coffee...")