Dental FAQ: Common Dental Questions & Answers
How safe are dental X-rays?
Exposure to all sources of radiation — including the sun, minerals in the soil, appliances in your home, and dental X-rays — can damage the body’s tissues and cells and lead to the development of cancer. Fortunately, the dose of radiation you are exposed to during the taking of X-rays is extremely small.
Advances in dentistry over the years have lead to the low radiation levels emitted by dental X-rays. Some of the improvements are new digital X-ray machines that limit the radiation beam to the small area being X-rayed, higher speed X-ray films that require shorter exposure time compared with older film speeds to get the same results, and the use of film holders that keep the film in place in the mouth (which prevents the film from slipping and the need for repeat X-rays and additional radiation exposure). Also, the use of lead-lined, full-body aprons protects the body from stray radiation (though this is almost nonexistent with the modern dental X-ray machines.) In addition, federal law requires that X-ray machines be checked for accuracy and safety every two years, with some states requiring more frequent checks.
Learn more about dental X-rays.
What are dental sealants, who should get them, and how long do they last?
Sealants are a thin, plastic coating that is painted on the chewing surfaces of teeth — usually the back teeth (the premolars, and molars) — to prevent tooth decay. The painted on liquid sealant quickly bonds into the depressions and groves of the teeth, forming a protective shield over the enamel of each tooth.
Typically, children should get sealants on their permanent molars and premolars as soon as these teeth come in. In this way, the dental sealants can protect the teeth through the cavity-prone years of ages 6 to 14. However, adults without decay or fillings in their molars can also benefit from sealants.
Sealants can protect the teeth from decay for many years, but they need to be checked for chipping or wear at regular dental check-ups.
Learn more about sealants.