X-rays, also known as radiographs, have long been part of preventive care in dentistry. X-rays are a form of electromagnetic radiation that is invisible to human eyes. When scientists first discovered evidence of these electromagnetic rays, they weren’t sure what they were, so they called them x-rays, & the name stuck.
X-rays can pass through the soft tissues of the face & mouth (lips, cheeks, etc.) but are absorbed by the hard material of teeth & bone. This allows the dentist to see potential oral health issues that may not be easily visible from the outside. X-rays are used primarily to find cavities, but dentists also use them to look at tooth roots, to evaluate the health of the bone surrounding the tooth, to assess possible periodontal (gum) disease problems, to analyze tooth & jaw positioning & to keep track of development in younger patients.