I have, or am recovering from, an eating disorder. What can it do to my teeth, and how do I talk to a dentist about it?

What an eating disorder can do to the mouth

The mouth is often one of the first places the effects of an eating disorder show, and it is also one of the places where protective care can start right away. Three mechanisms account for most of what a dentist sees.

Stomach acid and the teeth

Repeated vomiting brings stomach acid into the mouth. Enamel does not grow back, so each exposure can dissolve a little more of the surface. Over time the inner surfaces of the upper front teeth can become smooth and thin, the edges can look shorter or more translucent, fillings can begin to sit higher than the softened tooth around them, and the teeth can change in color and shape. Thinned enamel exposes the dentin underneath, which is why cold, sweet or even cool air can begin to sting. Acid reflux (GERD) can produce a very similar pattern, which is one reason a dentist who sees erosion will usually ask about both reflux and vomiting rather than assume either.

Dry mouth

Saliva neutralizes acid, washes away food and carries the minerals that re-harden enamel. Dehydration and many medications, including some antidepressants, can reduce saliva. A dry mouth is more prone to decay, soreness and bad breath, and it makes acid exposure more damaging because there is less saliva to buffer it. Never stop or change a medication to improve dry mouth without talking to the physician who prescribed it; there are usually other ways to manage the dryness.

Gums, soft tissue and salivary glands

Without adequate nutrition, gums and the lining of the mouth can become tender and bleed easily. The salivary glands at the angle of the jaw and in front of the ears can swell, sometimes painlessly. A chronically sore throat is also common with purging. A dental exam may find cavities or gum inflammation that have developed quietly. None of these findings proves an eating disorder on its own, and a dentist should not treat them as a diagnosis; they are reasons to protect the mouth and to make sure your physician is involved.

What changes the answer for you

The right dental plan depends on a few details that only an examination and an honest conversation can settle. You do not need to volunteer more than you are comfortable with, but these are the things that shift the plan.

If you are already working with a physician, dietitian or therapist, telling your dentist who they are allows the dental plan to fit around the medical one. If you are not yet, your dentist can encourage that step without pressure. For a broader look at why the medical history comes first at a dental visit, see why your dentist asks about medications before looking at your teeth.

Protecting your teeth starting today

These steps are gentle, free or inexpensive, and can begin before any appointment.

• Do not brush right after vomiting. Brushing softened enamel scrubs away minerals that saliva could otherwise restore. Rinse first and wait, ideally around an hour, before brushing.
• Rinse with water, or with a fluoride rinse as directed on the label. Plain water, or a rinse your dentist suggests, helps dilute and wash away acid. Follow the label and your dentist's advice rather than any fixed routine from the internet.
• Use fluoride as your dentist advises. Fluoride toothpaste, a prescription-strength paste or an in-office varnish can help re-harden softened enamel and ease sensitivity.
• Sip water through the day for dry mouth. Sugar-free gum or lozenges may be suggested to stimulate saliva. Caffeine, alcohol and tobacco tend to make dryness worse.
• Keep acidic and sugary drinks to mealtimes. Sipping over hours keeps the mouth acidic; having them with a meal and following with water limits the exposure.
• Choose a soft brush and a light touch. Thinned enamel and tender gums do better with less force, not more.
• Report lingering sensitivity. If cold sets off pain that lasts, the cause may be more than exposed dentin; cold sensitivity that lingers explains what the dentist will want to know.

How a dental visit can go

A first visit with this history can be slower and more conversational than you may expect, and you can ask for it to be.

• Medical and medication history. The team asks about health conditions, medications and supplements, reflux and dry mouth. You can list medications without explaining why you take them.
• Erosion and sensitivity assessment. The dentist looks at which surfaces are worn, how thin the edges have become and whether existing fillings are standing above the tooth.
• Gum measurements and soft-tissue check. A gentle check for bleeding, tenderness and gland swelling, with pocket measurements if indicated.
• X-rays when indicated. Only when the examination suggests they will change the plan, for example to look for decay between teeth.
• A staged plan. Protection first: fluoride, desensitizing care, dietary and home-care steps and, if needed, temporary coverage of exposed dentin. Repair later, often once the acid exposure is controlled: bonding, onlays or other restorations, at a time your dentist will discuss with you. If several front teeth have shortened, the planning questions in short, worn teeth: what should be checked before rebuilding them apply.
• Comfort measures. You may ask for a stop signal, for a trusted companion to be present, and for breaks. The practice lists anxiety-free options among its services; ask the office which would fit your visit.

Talking about it: as much or as little as you choose

Many people find it hard to tell a dentist about purging, even when they suspect it is affecting their teeth. Shame, fear of a lecture and uncertainty about what will happen next are the usual reasons. A few points may make the conversation easier.

• You set the boundary. "I have a history of acid erosion and I would like to protect my teeth" is a complete, useful sentence. You can add detail later, or never.
• The dentist's job is the mouth. Treatment of the eating disorder belongs with your physician and mental health clinician; the dentist's role is to protect and repair teeth and to coordinate with them if you wish.
• Written notes help. The worksheet below lets you decide in advance what to say and hand it over instead of saying it aloud.
• You can ask how the office handles the information. Your dental record is confidential, and you can ask who on the team will see what you share.
• Nervousness is normal. If the visit itself feels like a lot, a first-visit plan that starts with your concerns describes how to tell the office what you need before you arrive.

An eating disorder is a serious, treatable medical condition, and help is worth seeking at any stage. Involving your physician is one of the most important steps you can take, for your teeth and for your overall health.

When to seek emergency or crisis help

Some situations should not wait for a dental appointment or an online request form.

• Go to emergency care (call 911 or the nearest emergency department) for difficulty breathing or swallowing, rapidly spreading swelling of the face or neck, fever with facial swelling, bleeding that will not stop, fainting, chest pain or an irregular heartbeat. These are medical emergencies, not dental ones.
• For a mental health crisis, contact your physician or mental health clinician, or call or text 988, the 988 Suicide & Crisis Lifeline in the United States, which is available around the clock and is not only for suicidal thoughts.
• For dental pain or a chipped edge without those signs, contact the office during business hours and describe what you notice.

The next step

If you would like a dentist to look at your teeth with this history in mind, you can request an appointment online (a request is not a confirmed appointment; the team follows up) or call during office hours. Fill in the worksheet below first, bring a current medication list, and let the office know if you would like a longer or quieter appointment. Protecting your teeth now helps keep later options open, whatever pace your recovery takes.