Moreover , guidelines from the american dental association state that healthy adults should have a bitewing x-ray no more than once every two or three years , and that there is little reason to x-ray patients who do not have symptoms .

此外，美国牙科协会的指南规定健康成年人每两到三年不应拍超过一次的咬翼片，并且没有理由给无病症的病人拍x光。