More Than a Smile: Protecting Oral Health Throughout Breast Cancer Treatment

Breast cancer care rightly focuses on treating the cancer, but the wider effects of treatment deserve attention too. Teeth, gums and the soft tissues of the mouth can be affected by chemotherapy, hormone therapy and bone-strengthening drugs. A dental appointment may not feel urgent when a treatment plan is being arranged, yet it can be a practical and worthwhile part of preparing for care.

This article offers general information for people in the UK. It is not a substitute for advice from your oncology team or dentist, who can consider your individual circumstances.

Why the mouth matters during treatment

Chemotherapy can reduce the body’s ability to fight infection and repair tissues, which may lead to mouth ulcers, sore gums, dryness or changes in taste. Some drugs can make the mouth more sensitive, and a reduced white blood cell count may mean that a minor dental infection becomes more significant.

Hormone therapy may cause dry mouth for some people, while bone-strengthening treatments such as bisphosphonates or denosumab carry a small but recognised risk of a jaw complication called medication-related osteonecrosis of the jaw, often shortened to MRONJ. This is uncommon, but it is one reason why dental health is discussed before and during certain treatments.

Good oral care is not about achieving perfection. It is about reducing the chance of pain, infection and treatment delays, and about knowing when to ask for help.

Before treatment starts: a useful conversation

If there is time before chemotherapy or bone-strengthening treatment begins, arrange a dental check. Tell your dentist that you have been diagnosed with breast cancer and what treatment is planned. If you are unsure of the exact drug names, your hospital team can provide a letter or treatment summary.

The dentist can assess your teeth and gums, treat active problems where appropriate, and give you a written plan for future care. They may also take X-rays or advise on whether any dental work should be completed before treatment starts. It is important that this is coordinated with your oncology team, as cancer treatment should not usually be delayed without good reason.

Ask your hospital team whether they have a link with a hospital dental service or a special care dentistry team. These services can be helpful if you have complex needs, severe dental anxiety or a treatment plan that affects dental decisions.

Mouth care during chemotherapy

During chemotherapy, gentle routine care matters more than ever. Brush your teeth twice a day with a fluoride toothpaste, using a soft-bristled brush. If your gums are sore, continue to brush carefully rather than stopping altogether. Spit out the toothpaste rather than rinsing vigorously with water afterwards, unless your dental team has advised otherwise.

Floss only if you usually do so and your gums are not bleeding heavily. If your platelet count is low or your team has advised you to avoid flossing, follow their guidance. Dentures should be cleaned regularly and removed at night where possible, and you should tell your team if they become loose or rub.

A plain saline or salt-water rinse can be soothing if your mouth feels sore. Avoid alcohol-containing mouthwashes unless your dentist or oncology team has recommended one, as they can sting dry or broken tissues. Keep lips moisturised and sip water regularly if your mouth feels dry.

Contact your oncology team promptly if you develop mouth ulcers that make eating or drinking difficult, bleeding gums that do not settle, white patches in the mouth, a high temperature, or any sign of infection. Do not wait for a routine dental appointment if you feel unwell during chemotherapy.

Hormone therapy and bone-strengthening treatment

Hormone therapy can cause dryness or sensitivity for some people, and ordinary dental care remains important. If you are taking a bone-strengthening drug, tell your dentist before any invasive dental procedure, including an extraction, gum surgery or dental implant. Your oncology team should also be informed, because planning may need to take your treatment into account.

Do not stop or delay a bone-strengthening medicine without advice from your oncology team. If dental treatment is needed, the aim is usually to coordinate care safely rather than to avoid dental work altogether.

Accessing NHS dental care

NHS dental care is not free for most adults in the UK, and you will usually pay NHS dental charges unless you are exempt. A cancer diagnosis does not automatically mean free routine dental care, so it is worth checking your entitlement and asking about help with health costs if you are on a low income. Your local Citizens Advice service or the NHS website can explain current arrangements.

If you do not have a regular dentist, you can use the NHS website to look for services accepting new patients. For urgent dental problems, contact your dental practice first. If you cannot reach a dentist, use NHS 111 for advice on out-of-hours urgent care. If you are receiving hospital treatment, ask your breast care nurse or oncology team whether a hospital dental service can help.

A simple checklist

• Tell your dentist about your breast cancer diagnosis and treatment plan.
• Ask your oncology team before arranging dental work if you are about to start treatment.
• Brush gently twice daily with fluoride toothpaste.
• Report mouth sores, bleeding, white patches or fever to your cancer team.
• Tell your dentist before any extraction or invasive dental procedure if you take a bone-strengthening drug.
• Ask for help if dental costs or access are a barrier.

Mouth care may seem a small part of a large treatment plan, but it is a practical way to protect comfort and reduce avoidable problems. If you are unsure what to do, ask your breast care nurse, oncology team or dentist. Clear answers are part of good care, and no question about your mouth is too minor to raise.