How Medications Affect Oral Health in Seniors

A significant proportion of adults over 65 in the UK take four or more prescribed medicines regularly. Many of those medicines have oral effects, and the effects compound when several are taken together.

This matters because the pattern of dental disease in later life often looks like a failure of hygiene when it is nothing of the sort. Someone who has looked after their teeth for sixty years can develop rapid root decay in eighteen months after starting a new medication, and the cause is frequently missed by everyone involved — including the patient, who concludes they must be doing something wrong.

Reduced salivary flow, or xerostomia, is by some distance the most consequential medication effect on the mouth. Several hundred medicines list it as a side effect.

Commonly implicated groups include:

• Antidepressants, particularly tricyclics but also SSRIs and SNRIs

• Antihistamines

• Diuretics, widely used for blood pressure and heart failure

• Antihypertensives, including beta blockers, ACE inhibitors and calcium channel blockers

• Anticholinergics, including drugs for overactive bladder and for Parkinson's disease

• Opioid analgesics

• Antipsychotics

• Bronchodilators and inhaled medications

• Some chemotherapy agents, and radiotherapy to the head and neck, which can cause permanent salivary damage

The effect is dose-related and cumulative. Someone taking one such drug may notice little; someone taking four may have a markedly dry mouth.

Saliva is not simply moisture. It performs several functions that are difficult to replace.

Buffering. It neutralises acid produced by plaque bacteria after eating. Without adequate flow, plaque pH stays low for far longer after each exposure.

Clearance. It washes away food debris and sugars.

Remineralisation. It supplies calcium and phosphate that redeposit into enamel, reversing early demineralisation.

Antimicrobial activity. It contains lysozyme, lactoferrin, immunoglobulins and other antimicrobial components.

Lubrication, for chewing, swallowing, speech and denture retention.

Taste, since taste molecules must dissolve in saliva to reach receptors.

Lose flow and you lose all of these at once. Our article on snacking frequency and decay risk explains the acid-attack mechanism that saliva normally controls.

Root caries. The signature problem in older adults. Where gums have receded, root surface is exposed, and root dentine demineralises at a higher pH than enamel — around 6.7 rather than 5.5 — meaning it dissolves under far milder acid conditions. Root decay can progress rapidly and often circles the tooth at the gum line.

Rapid decay around existing restorations, at crown and filling margins.

Oral candidiasis. Thrush, angular cheilitis at the corners of the mouth, and denture stomatitis. More common in dry mouths, in denture wearers, in those using steroid inhalers without rinsing, and in diabetes.

Difficulty wearing dentures, since retention depends partly on a saliva film.

Soreness and ulceration of dry mucosa.

Difficulty eating and swallowing, which affects nutrition.

Altered taste, which affects appetite and food choice.

Halitosis. Our article on whether bad breath is a gum problem covers the causes.

Disturbed sleep, from waking to sip water.

Gum overgrowth (gingival hyperplasia). Associated particularly with phenytoin, ciclosporin and calcium channel blockers such as nifedipine and amlodipine. The overgrown tissue is difficult to clean, which worsens inflammation and creates a cycle. Meticulous plaque control reduces the severity considerably; in some cases surgical reduction or a discussion with the prescriber about alternatives is appropriate. Our gum contouring page covers the surgical option.

Bleeding risk. Anticoagulants and antiplatelets affect bleeding after extractions and periodontal treatment. Current UK guidance generally advises against stopping these medications for routine dental procedures, since the risk of a thrombotic event usually outweighs the bleeding risk, with local measures used to control bleeding instead. Always tell your dental team what you take and never stop it yourself.

Medication-related osteonecrosis of the jaw. A rare but serious complication associated with bisphosphonates and denosumab, used for osteoporosis and in cancer care. Risk is low for those on oral bisphosphonates for osteoporosis and considerably higher for those on high-dose intravenous regimens in oncology. It affects how extractions and implant treatment are planned, and it is a reason to complete any needed dental work before starting these drugs where possible. Our article on implants and osteoporosis medication covers this.

Sugar in liquid medicines. Syrups and lozenges taken frequently, particularly at night, are a significant decay risk. Sugar-free versions are often available.

Acidic medicines, including some effervescent preparations and inhalers, which contribute to erosion.

Steroid inhalers, associated with oral candidiasis. Rinsing the mouth after use reduces this substantially and is simple to do.

Immunosuppressants, increasing infection risk and impairing healing.

Taste disturbance, from many drug classes.

Tell your dental team everything you take, including over-the-counter medicines and supplements, and update the list whenever it changes. This is not administrative box-ticking — it changes your risk category and what should be done about it.

Do not stop or alter medication because of oral side effects. Raise it with the prescriber, who may be able to adjust the timing, the dose, or switch to an alternative with less oral effect. Some options exist and some do not.

Use high-fluoride toothpaste where prescribed. A 5,000 ppm fluoride toothpaste is commonly prescribed for high decay risk and is one of the most effective available measures for root caries.

Spit, do not rinse, after brushing. Rinsing washes away the fluoride that would otherwise remain at the tooth surface.

Clean between the teeth daily, using whatever tool you can manage — interdental brushes are generally easier than floss for those with dexterity limitations.

Consider an electric toothbrush, which requires less manual dexterity and often improves plaque removal.

Sip water frequently. Avoid sugary or acidic drinks for this purpose.

Use sugar-free chewing gum after meals if you can, which stimulates any remaining flow.

Saliva substitutes and gels are available and help some people, particularly at night. Choose products with a neutral pH.

Avoid alcohol-containing mouthwashes, which dry the mouth further.

Reduce the frequency of sugar exposure, not just the amount.

Rinse after inhaler use.

Clean dentures daily and leave them out at night, which reduces the risk of denture stomatitis. Our dentures page covers care.

Attend more frequently where risk is high — three-monthly reviews with fluoride varnish application are common in this situation, and they catch root decay while it is still arrestable.

Our dental hygiene page explains what hygiene appointments involve, and our article on how often to see a hygienist covers intervals.

Which medications cause dry mouth?

Several hundred do. The most commonly encountered are antidepressants, antihistamines, diuretics, blood pressure medicines, anticholinergics for bladder or Parkinson's disease, opioids and antipsychotics. The effect compounds when several are taken together.

Should I stop my medication if it is affecting my teeth?

No. Never stop or change prescribed medication because of oral side effects. Raise it with your GP or prescriber, who can consider alternatives, and tell your dental team so that protective measures can be put in place.

Why am I suddenly getting decay after decades without any?

Reduced saliva flow from medication is a common explanation, particularly where decay is appearing at the gum line on root surfaces. Gum recession exposing root dentine, which dissolves at a milder acid level than enamel, is the other half of the picture.

What is root decay and why is it different?

Decay on exposed root surface rather than on the crown of the tooth. Root dentine demineralises at around pH 6.7 compared with 5.5 for enamel, so it is vulnerable to much milder acid challenges. It can progress quickly and is common in older adults with recession and dry mouth.

Do I need a special toothpaste?

Where decay risk is high, a prescription-strength 5,000 ppm fluoride toothpaste is commonly recommended and is well evidenced for root caries. Your dentist can advise whether it is appropriate for you.

Can dry mouth be treated?

The underlying cause often cannot be removed, but it can be managed — frequent water, sugar-free gum, saliva substitutes, high-fluoride toothpaste, more frequent professional care, and careful attention to the frequency of sugar intake.

Why do my gums look swollen since starting a new tablet?

Some medicines, particularly calcium channel blockers such as amlodipine, phenytoin and ciclosporin, can cause gum overgrowth. Excellent plaque control reduces the severity substantially. Mention it to both your dentist and your prescriber.

Bring an up-to-date list of your medications to your next dental appointment, including anything bought over the counter. It changes what we look for and how often you should be seen.

If your mouth has become dry, if food is catching in new places, or if you have noticed dark areas at the gum line, arrange an assessment rather than waiting. Root decay caught early can often be arrested with fluoride rather than drilled.

You can contact our team to arrange an appointment at our Wimpole Street practice. Our dental check-up and dental hygiene pages explain what is involved.

This article provides general information and does not constitute individual dental or medical advice. Do not start, stop or change any prescribed medication on the basis of this article — discuss any concerns with the prescribing clinician. The effects described vary between individuals and medicines, and your own risk can only be assessed following clinical examination and medical history review. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 1 September 2027