You must remove all jewelry. The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. There is no discomfort. There is low radiation exposure. X-rays are monitored and regulated to provide the minimum amount of radiation exposure needed to produce the image.
Most experts feel that the risk is low compared with the benefits.
Pregnant women and children are more sensitive to the risks of the X-ray . The X-ray shows normal structures for the age of the patient.