Multiple Sclerosis and Orthodontic Treatment

How MS affects dental and orthodontic appointments

MS fatigue — distinct from ordinary tiredness — is one of the most disabling and commonly reported symptoms. It can be severe, unpredictable, and disproportionate to activity level. Orthodontic appointments are typically brief, but for MS patients even a short trip from home plus the physical and cognitive demands of an appointment can trigger profound fatigue. Morning appointments — before fatigue accumulates through the day — are generally better tolerated than afternoon ones. Appointments should be kept as short as possible, and patients should be allowed to rest in the waiting room before and after. Heat sensitivity (Uhthoff's phenomenon) affects the majority of MS patients: exposure to warmth temporarily worsens neurological symptoms including weakness, visual disturbance, and balance. The orthodontic clinic environment should be kept comfortably cool. Heat-generating procedures — dental light exposure, prolonged bracket bonding with heat from curing lights — should be managed with short bursts and breaks where needed.

Trigeminal neuralgia and facial pain in MS

Trigeminal neuralgia — severe, lancinating facial pain triggered by touch, eating, or cold — occurs in around 2–5% of MS patients and is more common in MS than in the general population because MS plaques can affect the trigeminal nerve root entry zone. This creates a diagnostic challenge during orthodontic treatment: lancinating or severe facial pain in an MS patient may be trigeminal neuralgia rather than orthodontic pain, periodontal disease, or toothache. MS patients should be specifically asked about facial pain patterns before starting treatment, and any new severe facial pain during treatment should be assessed carefully. Orthodontic adjustment schedules may need to be modified if trigeminal neuralgia is active. Medical management of trigeminal neuralgia — carbamazepine, oxcarbazepine, or gabapentin — does not contraindicate orthodontic treatment but should be noted in records.

Sensory changes and their effect on orthodontic assessments

Many MS patients experience paraesthesia — altered or reduced sensation — in the face, mouth, or tongue. This can affect bite registration accuracy: a patient with reduced oral sensation may not correctly perceive their bite position, leading to inaccurate clinical records. Orthodontists should take extra care with bite registrations and may need to perform them more slowly, with the patient guided to maximum intercuspation manually. Sensory changes can also alter pain perception during treatment — some MS patients report less orthodontic soreness than expected, while others report heightened sensitivity. Communicating openly about symptom changes after adjustments helps both patient and clinician calibrate responses appropriately.

Disease-modifying therapy and effects on bone

Modern MS treatment centres on disease-modifying therapies (DMTs) that reduce relapse frequency and slow progression. Natalizumab (Tysabri), ocrelizumab (Ocrevus), alemtuzumab (Lemtrada), and other DMTs work primarily on the immune system and their direct effects on bone metabolism are limited. Published data on the orthodontic implications of specific DMTs is sparse. Fingolimod (Gilenya) — an oral sphingosine-1-phosphate receptor modulator — has been associated with a small number of case reports of gingival enlargement, which is relevant to orthodontic treatment because gingival overgrowth impedes tooth movement and makes hygiene harder. Orthodontists managing patients on fingolimod should monitor gingival health closely throughout treatment. For most other DMTs, no specific orthodontic precautions are currently recommended beyond standard practice.

Corticosteroid use during MS relapses

Relapses in MS are commonly treated with high-dose intravenous methylprednisolone (typically 500 mg to 1 g per day for three to five days). Repeated courses of corticosteroids are associated with reduced bone mineral density — a relevant consideration for orthodontic treatment because adequate alveolar bone density is required for predictable tooth movement and anchorage. Patients who have received frequent corticosteroid courses for MS relapses may warrant discussion of bone health with their neurologist. Long-term oral corticosteroids for any reason should also be noted and may indicate the need for a more conservative approach to force levels and extraction decision-making. Calcium and vitamin D supplementation is commonly prescribed to corticosteroid-treated MS patients, which has a modest beneficial effect on bone density.

Aligner compliance with hand dexterity difficulties

Clear aligner treatment requires the patient to remove and re-insert their aligners multiple times per day. This demands reasonable hand strength and fine motor control — something that is impaired in MS patients with upper limb weakness, tremor, or spasticity. Patients with moderate or severe hand dexterity impairment may genuinely struggle to remove tight-fitting aligners without assistance, and forgetting or avoiding removal for eating and drinking leads to poor compliance. Aligner removal tools are available — small plastic hooks designed to assist tray removal — and these can be invaluable for patients with grip or dexterity difficulties. Fixed braces avoid the compliance issue entirely and may be the more appropriate appliance choice for patients with significant upper limb involvement. The treating orthodontist should assess dexterity realistically at the treatment planning stage and discuss appliance options openly.

Relapse timing and orthodontic procedure planning

MS relapses — periods of new or worsening symptoms — are not predictable but are more likely during periods of stress, infection, or post-partum. Major orthodontic procedures — brace bonding, surgical exposure of impacted teeth, or orthognathic surgery — should be timed away from active relapses wherever possible. During a relapse, the patient's capacity to attend appointments and manage appliance care is reduced. Orthodontists should adopt a flexible scheduling approach for MS patients and have a clear plan for treatment pauses when needed. Communication with the MS nurse specialist — who is the day-to-day clinical contact for most UK MS patients — can help coordinate timing of orthodontic milestones around the patient's neurological management.

UK resources and liaison with the MS care team

The MS Society (mssociety.org.uk) provides information on dental care with MS, including guidance on accessing treatment adjustments and reasonable adjustments under the Equality Act 2010. The MS Trust similarly offers patient-facing resources. Most MS patients in the UK are managed by a neurologist, an MS nurse specialist, and often physiotherapy and occupational therapy. The MS nurse specialist is the most accessible contact for orthodontists wishing to discuss treatment timing, relapse frequency, DMT implications, or functional capacity. A brief introductory letter from the orthodontist to the MS nurse — with the patient's consent — at the start of a treatment course sets a useful foundation for communication during what may be a multi-year treatment period.

Useful related pages

This guide is for general information only. It is not a diagnosis, treatment plan, or substitute for advice from a registered dentist or orthodontist.