Cold Sores During Orthodontic Treatment

Why cold sores matter in a dental setting

Herpes labialis is caused by HSV-1, a virus that, once acquired, remains latent in the trigeminal ganglion for life. Reactivation produces visible cold sores on or around the lips, typically preceded by a prodromal period of tingling or itching. During an active outbreak, the virus is shed in high concentrations from the lesion. In a dental setting, active cold sores present a cross-infection risk — HSV-1 can be transmitted via direct contact, contaminated instruments, or glove-to-lesion contact, and can cause herpetic whitlow (finger infection) in healthcare workers or autoinoculation of the eye (herpetic keratoconjunctivitis) in the patient. The GDC and SDCEP infection control standards require dental practices to defer elective treatment when a patient has an active oral herpes lesion. This is a patient safety measure, not a punitive policy.

When to defer your orthodontic appointment

You should defer your orthodontic appointment if you have an active cold sore — that is, a visible lesion at any stage from blister to crusting. The virus is actively shed at all visible stages. Many practices also request deferral during the prodromal phase (tingling, burning, redness before a blister appears), because the patient is already shedding virus before the sore is visible. Once the lesion has completely healed and the skin is intact (typically 7 to 10 days from the first symptoms), it is safe to attend. Contact the practice as soon as you notice symptoms — do not wait until the day of your appointment to inform them. Most practices will rebook you without charge when a cold sore is the reason for cancellation.

What happens if you attend with an active cold sore

If you attend with an active cold sore, the orthodontist will almost always defer your appointment and reschedule. Proceeding with clinical treatment would expose clinical staff to unnecessary infection risk and would risk autoinoculation or worsening of your own lesion through intraoral manipulation. Some practices may be able to complete non-contact elements of the appointment (photographs, patient education) but no intraoral work. If you are not sure whether your symptoms constitute an active lesion, call the practice and describe your symptoms — they will advise you.

Why orthodontic treatment can trigger cold sores

Several aspects of orthodontic treatment create conditions that commonly trigger HSV-1 reactivation. Psychological stress — a well-established trigger — is often elevated around orthodontic appointments, particularly the first few visits. Physical stress on the lips from lip retractors, suction, and prolonged mouth-open positioning during bonding or adjustment can trigger outbreaks. UV light exposure (from dental curing lights) directed near the lip margin is a documented trigger. Lip dryness and friction from orthodontic wires poking the lip corners can cause small traumas that promote reactivation. Patients who know they are susceptible to stress- or trauma-triggered cold sores should be aware that the bonding appointment and early adjustment visits carry a higher-than-usual risk.

Prophylactic antivirals for frequent sufferers

Patients who experience frequent cold sore outbreaks — particularly if triggered by dental visits — may benefit from prophylactic antiviral therapy. Aciclovir (400 mg twice daily from 2 days before to 5 days after the appointment) or valaciclovir (500 mg once daily) prescribed by a GP or dentist can significantly reduce the likelihood of an outbreak around a scheduled appointment. This approach is well-established in the context of dental and maxillofacial surgery but is equally applicable to orthodontic appointments. If you reliably get a cold sore after orthodontic adjustments, discuss this with your GP before your next appointment. Over-the-counter aciclovir cream (Zovirax) applied during the prodromal phase can reduce lesion duration and severity for individual outbreaks.

Managing cold sores with aligners vs fixed braces

Aligner patients can remove their trays during an active outbreak to reduce friction and irritation to the lesion, and to minimise contamination of the aligner surface. However, reducing wear time below 22 hours a day risks losing tracking and delaying treatment. The advice during a brief outbreak (5 to 7 days) is to clean aligners thoroughly before reinsertion, avoid touching the lesion and then handling aligners without handwashing, and do not share aligners or aligner cases. Fixed brace patients cannot remove their appliance but should keep the wire away from the cold sore area where possible, use orthodontic wax over any bracket or wire causing direct friction to the lesion, and avoid using finger pressure near the lip. Both patient groups should not attend for adjustment appointments while a lesion is active.

Lip care during orthodontic treatment

Maintaining good lip health reduces the frequency of trauma-related cold sore triggers. During orthodontic treatment, lips are under more stress than usual — they are stretched during appointments, compressed against brackets, and more prone to dryness. Regular use of a fragrance-free lip balm reduces dryness and cracking. Staying well hydrated, managing stress, and using SPF lip balm when outdoors (UV is a known trigger) all reduce reactivation risk. Patients who experience very frequent outbreaks — more than 6 per year — should discuss this with their GP, as chronic suppressive antiviral therapy may be appropriate and will benefit both their general health and their orthodontic treatment schedule.

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.