Orthodontic Treatment with Autoimmune Disease: A Guide for UK Patients

How autoimmune disease affects orthodontic treatment

Autoimmune diseases influence orthodontic treatment through several mechanisms. Chronic inflammation can alter bone density and turnover, affecting how quickly and predictably teeth move. Medications used to suppress the immune system can slow bone remodelling, increase infection susceptibility, or cause oral side effects such as gingival overgrowth or ulceration. Joint involvement — particularly of the temporomandibular joint — can affect jaw stability and the long-term outcome of bite correction. Dry mouth, common in several autoimmune conditions, dramatically increases caries risk around fixed appliances. None of these factors automatically excludes orthodontic treatment, but they require careful pre-treatment planning and communication between the orthodontist and the patient's medical team.

Rheumatoid arthritis and TMJ involvement

Rheumatoid arthritis (RA) is a systemic inflammatory disease that can affect any synovial joint, including the temporomandibular joint (TMJ). TMJ involvement in RA can cause condylar resorption — progressive loss of the condylar head — which leads to a gradually deepening anterior open bite and changes in bite alignment over time. This makes orthodontic treatment particularly challenging, as the skeletal foundations are not stable. For patients with active TMJ involvement, orthodontic treatment should ideally be deferred until the disease is in remission and condylar resorption has stabilised, confirmed on imaging. Patients with well-controlled RA and no TMJ involvement can generally undergo orthodontic treatment, though their response to tooth-moving forces may be slower.

Lupus — oral manifestations and immunosuppressant effects

Systemic lupus erythematosus (SLE) presents a range of oral manifestations including ulceration, erythematous plaques, and mucosal sensitivity. These can make wearing fixed appliances uncomfortable and increase the risk of soft tissue irritation. Lupus is commonly managed with hydroxychloroquine, corticosteroids, and sometimes mycophenolate or azathioprine. Corticosteroids suppress bone turnover and can slow tooth movement. Long-term corticosteroid use is also associated with osteoporosis, which affects alveolar bone density. A pre-treatment dental review and liaison with the patient's rheumatologist is essential. Periods of active flare are not appropriate for starting or adjusting orthodontic treatment.

Sjögren's syndrome — dry mouth, caries risk, and oral hygiene

Sjögren's syndrome causes destruction of the salivary and lacrimal glands, resulting in severe dry mouth (xerostomia). Saliva is critical for buffering acids, remineralising enamel, and mechanically clearing the mouth of food and bacteria. Patients with Sjögren's syndrome have a dramatically elevated caries risk — fixed appliances increase this further by creating plaque-retentive areas around brackets and under archwires. Before starting orthodontics, caries activity must be well controlled. High-fluoride toothpaste, regular fluoride varnish applications, and meticulous oral hygiene instruction are essential. Clear aligners may be preferable over fixed appliances for some patients, though they carry their own considerations. Frequent review appointments are necessary throughout treatment.

Methotrexate and slow bone remodelling

Methotrexate is widely used in RA, psoriatic arthritis, and other autoimmune conditions. It inhibits folic acid metabolism, which affects rapidly dividing cells including osteoblasts and osteoclasts — the cells responsible for the bone resorption and deposition cycle that underlies tooth movement. Patients on methotrexate may show significantly slower tooth movement than expected, requiring lower force levels and extended treatment timelines. Folic acid supplementation, which is routinely prescribed alongside methotrexate, does not fully restore normal bone remodelling. The orthodontist should be informed of the methotrexate dose and be prepared to adjust force levels and appointment intervals accordingly.

Biological therapies (TNF inhibitors) and infection risk

Biological therapies including adalimumab, etanercept, and infliximab are TNF inhibitors used to manage severe RA, psoriatic arthritis, ankylosing spondylitis, and Crohn's disease. These drugs suppress the immune response at the cellular level and significantly increase susceptibility to infection. In orthodontic practice, the main concern is the risk of infection around fixed appliances — particularly periodontal inflammation and, in rare cases, serious infections from soft tissue breaks. The General Dental Council and NHS guidelines require that dental treatment involving a bleeding risk be discussed with the prescribing clinician. For patients on biologicals, rigorous oral hygiene, prompt management of any mucosal irritation, and close liaison with the medical team are essential.

Crohn's disease and oral health

Crohn's disease is a chronic inflammatory bowel condition with well-documented oral manifestations. These include cobblestone mucosal thickening, linear ulceration, angular cheilitis, and aphthous ulceration. The mucosal changes can make wearing fixed appliances uncomfortable and may complicate impressions or intraoral scanning. Crohn's patients are often on immunosuppressants including azathioprine, steroids, and biologicals. Nutritional deficiencies — particularly of iron, B12, and vitamin D — are common and can affect bone health and healing. Assessment of nutritional status and liaison with the gastroenterology team is advisable before starting treatment. Patients whose Crohn's disease is well controlled and whose oral manifestations are minimal are generally suitable for orthodontic treatment with appropriate monitoring.

Pre-treatment coordination with rheumatologist or GP

Before starting orthodontic treatment with any significant autoimmune condition, the orthodontist should write to the patient's rheumatologist or GP to confirm the current medication regimen, disease activity, and any contraindications to dental treatment. Key questions include whether the disease is currently in remission, whether any medication changes are planned, whether there is any TMJ or joint involvement relevant to treatment, and whether antibiotic prophylaxis is required for any procedures. This liaison protects the patient and ensures the orthodontist has the information needed to set appropriate treatment expectations and adjust force delivery if needed.

Monitoring during treatment

Patients with autoimmune conditions require more frequent review than standard orthodontic patients. The orthodontist should monitor for signs of mucosal irritation, unusual patterns of tooth movement, gingival inflammation, early caries, and any change in jaw or bite alignment that might indicate disease progression. Patients should be encouraged to report any oral symptoms promptly rather than waiting for scheduled appointments. If there is a significant disease flare — particularly one requiring increased immunosuppression or corticosteroid treatment — orthodontic adjustments should be deferred until the flare settles. Open communication between the patient, orthodontist, and medical team is the most important safeguard throughout treatment.

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