--- title: "Hypophosphataemia and Orthodontics UK Guide" url: https://virtualconsultant.online/guides/hypophosphataemia-orthodontics-uk description: "X-linked hypophosphataemia (XLH) and orthodontics in the UK: spontaneous abscesses, enamel defects, burosumab, and staged dental-then-orthodontic care." updated: 2026-09-08T00:00:00Z publisher: Virtual Consultant Online --- XLH Hypophosphataemia Rare Conditions Dental Abscesses # Hypophosphataemia and Orthodontics UK X-linked hypophosphataemia (XLH) is a rare, lifelong genetic condition that causes low blood phosphate and, in most people affected, distinctive dental problems including spontaneous abscesses and defective tooth mineralisation. Orthodontic treatment is possible for people with XLH, but it usually needs to follow — not precede — thorough dental assessment and any necessary restorative or root canal treatment. This guide is for information only and does not replace advice from your metabolic bone, dental, and orthodontic teams. [Start Photo Assessment](https://virtualconsultant.online/evaluations/quote) [Compare Costs](https://virtualconsultant.online/costs) ## What is X-linked hypophosphataemia? X-linked hypophosphataemia is a rare inherited condition caused by a mutation in the PHEX gene, leading to overproduction of a hormone called FGF23. Excess FGF23 causes the kidneys to waste phosphate, resulting in chronically low blood phosphate levels. Because phosphate is essential for mineralising bone and teeth, XLH causes rickets-type bone changes in growing children and a characteristic pattern of dental defects that are present in the vast majority of people with the condition, regardless of how well their bone disease is managed. ## Spontaneous dental abscesses without caries One of the most distinctive dental features of XLH is the development of spontaneous tooth abscesses in teeth that have no cavities and appear otherwise structurally sound. This happens because the pulp chamber and root canals in XLH teeth are often abnormally large, with the pulp tissue extending close to the outer surface of the tooth (a pattern sometimes described as pulp horns reaching almost to the enamel-dentine junction). This makes the pulp vulnerable to bacterial infection through microscopic defects in the enamel and dentine that would not normally allow bacteria through, causing abscesses to form without the usual warning sign of visible decay. ## Enamel hypoplasia and dentine defects Alongside the abscess risk, XLH commonly causes enamel hypoplasia — enamel that is thinner or less well mineralised than normal — and interglobular dentine, a defect in dentine mineralisation that leaves microscopic channels through which bacteria can track towards the pulp. Together, these defects mean XLH teeth are structurally more fragile and more vulnerable to pulp infection than typical teeth, even with good oral hygiene and a low-sugar diet. This is a direct consequence of the underlying mineralisation defect rather than a sign of neglect. ## Why dental assessment must come before orthodontic forces Because XLH teeth carry an elevated risk of spontaneous pulp infection, applying orthodontic forces to teeth with undiagnosed pulp involvement can be more likely to provoke or worsen an abscess. For this reason, a thorough dental assessment — including radiographs to check for early signs of pulp pathology — and treatment of any teeth needing root canal treatment or restoration is generally completed before starting orthodontic treatment, rather than proceeding directly to braces or aligners. Ongoing dental review continues throughout orthodontic treatment given the lifelong abscess risk. ## Impaired mineralisation and orthodontic tooth movement Some evidence and clinical experience suggests that the underlying mineral metabolism disturbance in XLH can also affect the alveolar bone that orthodontic forces act on, which may influence the pace or predictability of tooth movement in some patients. This is not a reason to avoid orthodontic treatment, but orthodontists managing XLH patients typically build in closer monitoring and may adjust force levels or treatment timelines based on how teeth are responding, rather than assuming standard rates of movement will apply. ## Burosumab and its relevance to dental and orthodontic care Burosumab is an anti-FGF23 monoclonal antibody available on the NHS for children and, more recently, some adults with XLH, and it directly targets the underlying hormonal cause of the condition rather than just replacing lost phosphate. By normalising phosphate handling, burosumab has been associated with improved bone mineralisation in some studies, and there is growing interest in whether it also improves dental mineralisation, particularly when started early in childhood. This is an evolving area, and whether or how burosumab affects dental defect severity or orthodontic planning is a conversation to have with the patient's metabolic bone specialist and dentist together. ## Coordinating XLH dental, medical, and orthodontic care XLH is managed by a metabolic bone or endocrinology team, often within a specialist NHS centre, and effective dental and orthodontic care depends on good communication across this multidisciplinary group. Sharing information about current treatment (conventional phosphate and vitamin D therapy, or burosumab), recent dental abscess history, and any planned changes in medical management helps the orthodontist time treatment appropriately and stay alert to the abscess risk that is specific to XLH rather than treating it as a routine malocclusion case. ## Useful related pages [Patient FAQs Hub](https://virtualconsultant.online/faq) [Osteogenesis Imperfecta and Orthodontics UK](https://virtualconsultant.online/guides/osteogenesis-imperfecta-orthodontics-uk) [Orthodontics with Autoimmune Disease UK](https://virtualconsultant.online/guides/autoimmune-disease-orthodontics-uk) [Get a Virtual Consultation](https://virtualconsultant.online/evaluations/quote) This guide is for general information only. It is not a diagnosis, treatment plan, or substitute for advice from a registered dentist or orthodontist. ### Compare next steps [Orthodontist Near Me](https://virtualconsultant.online/locations/orthodontic-treatment-near-me) [Clear Aligners Near Me](https://virtualconsultant.online/treatments/clear-aligners-near-me) [Invisalign Near Me](https://virtualconsultant.online/locations/invisalign-provider-near-me) [Browse Locations](https://virtualconsultant.online/locations) ### Ready for a clearer starting point? Upload guided photos and receive an indication of likely treatment options and pricing before booking appointments. [Get an Online Quote](https://virtualconsultant.online/evaluations/quote) ### Frequently Asked Questions Can someone with XLH have orthodontic treatment? Yes, orthodontic treatment is possible for people with X-linked hypophosphataemia, but it generally follows a thorough dental assessment and treatment of any teeth at risk of or already affected by spontaneous abscesses, rather than proceeding straight to braces or aligners. Why do people with XLH get dental abscesses without cavities? XLH teeth typically have abnormally large pulp chambers with pulp tissue extending close to the tooth surface, combined with enamel and dentine defects that let bacteria track towards the pulp through microscopic channels. This means abscesses can develop without the visible decay that usually gives a warning sign. Does XLH need to be dentally assessed before starting braces? Yes. Because of the elevated risk of spontaneous pulp infection in XLH teeth, a dental assessment including radiographs is generally carried out first, with any necessary root canal treatment or restorations completed before orthodontic forces are applied. Does burosumab treatment affect orthodontic planning for XLH? Burosumab normalises phosphate handling and has been associated with improved bone mineralisation in some studies, with growing interest in its effect on dental mineralisation, particularly when started early. Whether and how it changes orthodontic planning for an individual patient is a discussion for the metabolic bone specialist and dentist together. Does XLH affect how quickly teeth move during orthodontic treatment? Some clinical experience suggests the underlying mineral metabolism disturbance in XLH may influence the alveolar bone that orthodontic forces act on, which can affect the pace of tooth movement in some patients. This is generally managed with closer monitoring rather than being a reason to avoid treatment. Which specialists are involved in orthodontic care for XLH? Care typically involves the metabolic bone or endocrinology team already managing the patient's XLH, alongside a dentist experienced in the condition's abscess risk, and the orthodontist. Sharing information across this group about current medication and recent dental history helps time treatment safely. Explore your options Quick links Not sure where to start? Use these quick links to explore orthodontic treatments, typical costs, and helpful guides that explain what different options involve. Whether you're researching braces or clear aligners, comparing pricing, or just getting a feel for what comes next, you can browse at your own pace and come back when you're ready to request a quote. 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Upload guided photos and get a tailored recommendation for your teeth and bite. [Start Photo Assessment](https://virtualconsultant.online/evaluations/quote) [Find an Orthodontist](https://virtualconsultant.online/locations) Citation details Title Hypophosphataemia and Orthodontics UK Guide Publisher Virtual Consultant Online Published 2026-09-08 Updated 2026-09-08 URL [https://staging.virtualconsultant.online/guides/hypophosphataemia-orthodontics-uk](https://staging.virtualconsultant.online/guides/hypophosphataemia-orthodontics-uk)