Dental X-rays: are they safe and how often?
Dental X-rays use very small amounts of radiation and are an important tool to find cavities, bone problems, and infections your dentist can't see by eye. Learn why dentists recommend them, how safety measures work, and how often you might need them.
Medically reviewed by Dr. Jose, DDS — June 27, 2026
Why Dentists Use X-Rays
Your dentist can see a lot by looking in your mouth, but X-rays let them find problems they can’t spot with their eyes alone. Cavities often form between teeth or under existing fillings, where a visual exam misses them. X-rays also show bone loss from gum disease, tooth roots, cysts or other growths, and infections that may have no obvious symptoms yet.
Catching these problems early usually means simpler, less costly treatment. That’s why X-rays are a routine part of dental care, not optional add-ons.
How Radiation Exposure Works in Dental Settings
Dental X-rays expose you to radiation, but the amount is very small. A single dental X-ray delivers far less radiation than you receive from natural background sources (like the sun) over the same time period.
Dentists also use proven methods to keep your exposure as low as possible:
- Lead aprons and thyroid collars shield your body from stray radiation.
- Digital sensors (used in most modern offices) require less radiation than older film X-rays and give instant results.
- Faster film speeds and updated equipment reduce exposure time.
- Aiming rings ensure the X-ray beam is pointed precisely, avoiding unnecessary scatter.
How Often Do You Need X-Rays?
There’s no universal schedule. Your dentist tailors X-ray frequency to your individual risk profile. For example:
- Someone with a history of cavities, gum disease, or bone loss may need X-rays every 12–18 months.
- A person with excellent oral hygiene and no cavity history might need them every 3 years or longer.
- Children’s teeth and bones change quickly, so their schedule may differ from adults’.
- After major dental work or if you’re being treated for an infection, your dentist might recommend more frequent X-rays to monitor healing.
If your dentist recommends X-rays at a visit, it’s fair to ask: Why do I need them today? What are you looking for? Understanding the reason helps you feel confident in your care and makes it easier to notice changes at your next visit.
X-Rays and Pregnancy
If you’re pregnant or think you might be, tell your dentist and hygienist before any X-rays are taken. Pregnancy is a time when some dental care is deferred—not because it’s unsafe to be in a dental office, but because elective procedures are often put off.
Routine dental X-rays during pregnancy are usually postponed until after delivery. However, if you have a dental emergency (severe pain, infection, or trauma), your dentist and your OB-GYN can discuss whether an X-ray is necessary. If it is, lead aprons and other shielding protect both you and your baby, and modern digital X-rays minimize exposure.
Asking Good Questions About Your X-Rays
You have every right to understand why your dentist is recommending X-rays. Good questions to ask include:
- “What am I at risk for, and how will this X-ray help diagnose or prevent a problem?”
- “How does digital X-ray compare to other methods in terms of radiation?”
- “Can I see my X-rays and your findings?”
- “Do I need X-rays at every visit, or can we space them out?”
Your dentist should be able to explain their reasoning clearly. If you’re uncomfortable or want a second opinion, you can ask for copies of your X-rays to take to another dentist.
How MediMouth Helps
Dental X-rays are a tool, not a diagnosis or treatment. At MediMouth, we help you find dentists who communicate clearly about why they recommend X-rays and what they see in them. If you have questions about your X-rays or want to discuss the frequency of imaging, our member dentists are here to listen and help you make informed choices about your care.
Frequently asked questions
Do dental X-rays expose me to harmful radiation?
Dental X-rays use very small doses of radiation. Modern digital X-ray sensors and lead aprons further reduce your exposure. The amount of radiation from a routine dental X-ray is considered safe by dental and medical organizations. If you're concerned about radiation, talk to your dentist about your personal risk factors.
How often should I have dental X-rays taken?
There's no fixed schedule that applies to everyone. Your dentist will recommend X-rays based on your individual risk for cavities, gum disease, bone loss, and other conditions. Someone with a history of cavities may need them more often than someone with excellent oral health. Ask your dentist why they're recommending X-rays for you.
Are dental X-rays safe during pregnancy?
If you're pregnant, tell your dentist before any X-rays are taken. Routine dental X-rays are often postponed during pregnancy, but if one is necessary, your dentist and your OB-GYN can work together to determine what's safe. Lead aprons and other shielding are used to protect you and your baby. Never skip telling your dental team about pregnancy.