Orthodontics and Epilepsy UK — What Patients and Families Need to Know

Phenytoin and gingival hyperplasia

Phenytoin (Epanutin) is an older anti-epileptic medication that remains in use for certain seizure types. One of its well-documented side effects is drug-induced gingival hyperplasia — overgrowth of the gum tissue — which affects approximately 50% of patients taking the drug. The gums become enlarged, inflamed, and firmer than normal, often covering a significant proportion of the clinical crown of the teeth. This overgrowth is worsened by plaque accumulation, meaning that excellent oral hygiene can reduce its severity even if it cannot eliminate the effect entirely. Gingival hyperplasia creates a serious problem for orthodontic treatment: enlarged gum tissue makes bracket bonding more difficult, provides additional areas for plaque to accumulate around brackets and wires, and can impair tooth movement by creating soft tissue resistance. Before commencing orthodontic treatment in a patient taking phenytoin, a thorough periodontal assessment is required. In moderate to severe cases, gingivectomy (surgical removal of excess gum tissue) may need to be carried out before braces are fitted, and may need to be repeated during treatment if the tissue regrows. Patients considering a switch from phenytoin to an alternative anti-epileptic should discuss this with their neurologist — other drugs have significantly fewer dental side effects — but medication changes must never be made solely for orthodontic purposes.

Other anti-epileptic medications and dental health

Sodium valproate (Epilim) is a widely prescribed anti-epileptic drug that has implications for bone density with long-term use. Valproate has been associated with reduced bone mineral density in some studies, which is clinically relevant to orthodontic treatment because tooth movement relies on bone remodelling — the controlled removal and deposition of alveolar bone around tooth roots. In patients with reduced bone density, the rate and predictability of tooth movement may be affected, and the risk of root resorption (shortening of tooth roots during treatment) may be marginally increased, though this remains an area of active research. Lamotrigine (Lamictal), levetiracetam (Keppra), and carbamazepine (Tegretol) are generally associated with fewer dental side effects than phenytoin or valproate. However, carbamazepine can cause dry mouth (xerostomia), which reduces the protective effect of saliva and increases the risk of dental decay — an important consideration during brace treatment when cleaning is already more demanding. All patients should disclose their complete medication list to their orthodontist before treatment begins.

Risk of seizure during an orthodontic appointment

The orthodontic clinic environment introduces several potential seizure triggers for patients with epilepsy. Anxiety about dental treatment is a recognised seizure trigger in some individuals. The semi-reclined position in a dental chair can occasionally cause discomfort or distress, and prolonged appointment durations may be more fatiguing than patients with epilepsy can comfortably tolerate. Bright overhead lights, and in some cases the vibration or sound of instruments, can rarely act as sensory triggers. Local anaesthetics used in dentistry — lidocaine, articaine — are generally considered safe for people with epilepsy in standard doses, but the adrenaline (epinephrine) in some formulations can theoretically lower seizure threshold in susceptible individuals. This is a nuanced area; most patients with well-controlled epilepsy tolerate dental local anaesthetics without incident, but the treating clinician should be aware of the patient's seizure type and frequency before proceeding. Shorter appointment slots, morning appointments when fatigue is lower, and the availability of a trusted accompanying person can all reduce risk.

Emergency protocols: seizure first aid in orthodontic practice

All UK dental practices are required by the Care Quality Commission to have up-to-date medical emergency training and equipment. Orthodontic practices should ensure that the team is trained in seizure first aid in line with the Epilepsy Society and Resuscitation Council guidance. If a patient has a tonic-clonic seizure in the dental chair, the priorities are to protect the patient from injury — removing loose dental instruments from the area, cushioning the head if possible, and not restraining the patient — and to time the seizure. Most tonic-clonic seizures end within two to three minutes. If the seizure lasts longer than five minutes, or if the patient does not recover consciousness within a normal timeframe, an ambulance should be called. Buccal midazolam is a rescue medication carried by some patients with severe epilepsy that can be administered by a trained family member or carer; the practice team should know if a patient carries this and ensure the accompanying person is present at appointments.

Appliance safety considerations during seizures

For patients whose epilepsy is not fully controlled — particularly those who experience frequent tonic-clonic or atonic (drop) seizures — the safety of orthodontic appliances warrants careful consideration. During a generalised seizure, the mouth may be forcibly closed, and any loose or removable items in the mouth represent an aspiration or swallowing risk. A bracket that becomes debonded, or a short length of wire that has become displaced, could potentially be inhaled or swallowed during a seizure. For patients with well-controlled epilepsy and a low seizure frequency, this risk is theoretical rather than practically significant — the same risk exists for anyone wearing dental appliances. However, for patients with frequent uncontrolled seizures, the clinical risk-benefit analysis shifts. Fixed bonded appliances are inherently more secure than removable ones during a seizure, because they cannot be inadvertently displaced by tongue or cheek movement. Removable retainers worn at night should be discussed with the patient's neurologist if nocturnal seizures are a feature.

Fixed appliances vs removable appliances for patients with epilepsy

The choice between fixed and removable orthodontic appliances for a patient with epilepsy should be made with full awareness of seizure frequency and type. For patients with well-controlled epilepsy — particularly those who are seizure-free on medication — standard fixed braces or clear aligners are generally suitable with standard precautions. For patients with frequent tonic-clonic or generalised seizures, fixed appliances may be preferred over removable aligners for the appliance safety reasons described above. For nighttime retainer wear post-treatment, a bonded fixed retainer on the lingual surface of the teeth provides retention without the need for a removable device that could be displaced during a nocturnal seizure. Some orthodontists and neurologists will jointly advise against removable intraoral devices for patients with frequent nocturnal seizures. This decision should involve the patient, their family or carers, the orthodontist, and the treating neurologist.

Coordination with the neurologist

Orthodontic treatment for a patient with epilepsy should not proceed in isolation from the patient's neurology team. The orthodontist should be provided with information about seizure type and frequency, current anti-epileptic medications and any anticipated changes, and whether the patient's epilepsy is considered well controlled or refractory. A brief letter or clinic summary from the neurologist is often helpful. If medication changes are being considered around the time orthodontic treatment is due to start — for example, a transition away from phenytoin — the timing of treatment commencement should be coordinated accordingly. Patients should not attempt to alter their anti-epileptic medication regime to accommodate orthodontic treatment without specialist neurological input, as the consequences of poorly managed epilepsy are far more serious than any orthodontic consideration.

Disclosure and wearing medical ID

Patients with epilepsy should always disclose their diagnosis and medication list before orthodontic treatment begins. This is not optional — it is a patient safety requirement and allows the orthodontist to conduct a proper clinical risk assessment, adapt the treatment plan if necessary, and ensure the practice team is prepared for a potential medical event. Wearing a medical ID bracelet or necklace — such as those provided by MedicAlert or the NHS-linked services — is strongly recommended for patients with epilepsy, particularly during dental appointments where the patient may be alone in the chair without an accompanying person who knows their history. Many patients also use apps or digital medical IDs on their phones as a supplementary record. Some patients prefer to have a trusted person accompany them to orthodontic appointments throughout treatment for added safety and reassurance.

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.