{"entity":{"id":"dry-mouth-teeth-after-head-neck-radiotherapy","kind":"technology","name":"Dry mouth, teeth and taste after head and neck radiotherapy","aka":[],"tldr":"Radiotherapy to the head and neck damages the salivary glands and, through the dry mouth that follows, the teeth. Planning that steers dose away from the parotid glands roughly halves lasting dryness and lets saliva recover over a year or two. Teeth need a dental assessment before treatment starts, because extractions afterwards risk the jawbone failing to heal.","summary":"Parotid-sparing planning is the intervention that changed this. In the PARSPORT randomised trial, grade 2 or worse dry mouth at 12 months occurred in 38 per cent of patients given intensity-modulated radiotherapy against 74 per cent given conventional radiotherapy, and at 24 months in 29 against 83 per cent. The trial also reported \"significant benefits\" in \"recovery of saliva secretion\" with the modulated technique at both time points, with no difference in locoregional control or survival. Recovery of saliva is therefore not a hope but a measured outcome, and it depends on what the planning did.\n\nWhen dryness persists, pilocarpine is the drug with randomised evidence. In 207 patients who had received at least 4,000 centigray, oral dryness improved in 44 per cent on 5 mg three times daily against 25 per cent on placebo, with overall improvement in 54 against 25 per cent; sweating was the main side effect and 6 per cent of the 5 mg group and 29 per cent of the 10 mg group withdrew because of adverse effects. Amifostine is covered by ASCO's protectants guideline and is little used because of hypotension, nausea and infusion time. Acupuncture for dry mouth has its own record and a weaker evidence base. Saliva substitutes, sugar-free gum and frequent sips help symptoms without restoring gland function.\n\nTeeth are the part that is preventable and most often missed. A dental assessment before radiotherapy, with any doubtful teeth removed while the jaw can still heal, plus lifelong daily high-fluoride toothpaste or trays and regular dental review, is the standard of care. Radiation caries progresses quickly in a dry mouth, and an extraction from an irradiated mandible can trigger osteoradionecrosis, for which hyperbaric oxygen has Cochrane-level moderate evidence.\n\nTaste is the symptom people report most and the one with the least evidence. It changes within the first weeks of treatment and usually improves over the months afterwards, but OnCo has not found a cohort with a recovery curve it can stand behind, and no treatment has reliable randomised support. That gap is stated rather than filled.\n\nWhat comes back, and when: partial, over one to two years, and mostly determined by the radiotherapy plan. Saliva recovers measurably after parotid-sparing treatment and much less after conventional treatment. Teeth do not come back, which is why the dental work belongs before the first fraction.","status":"standard-of-care","asOf":"2026-10-02","wikipedia":"https://en.wikipedia.org/wiki/Xerostomia","links":[{"label":"PARSPORT: parotid-sparing intensity modulated versus conventional radiotherapy in head and neck cancer (Lancet Oncol 2011)","url":"https://doi.org/10.1016/S1470-2045(10)70290-4"},{"label":"Oral pilocarpine for post-irradiation xerostomia in patients with head and neck cancer (NEJM 1993)","url":"https://doi.org/10.1056/NEJM199308053290603"},{"label":"ASCO 2008 clinical practice guideline update: use of chemotherapy and radiation therapy protectants (JCO 2009)","url":"https://doi.org/10.1200/JCO.2008.17.2627"}],"tags":["rejuvenation","survivorship","evidence:strong"],"related":["idea-moon-mucositis-taste-programme"],"cancers":["head-and-neck","thyroid"],"sections":["rejuvenation","supportive-care","radiation"],"technologies":["imrt-igrt","acupuncture-xerostomia","photobiomodulation-mucositis","hyperbaric-oxygen-radiation-injury","survivorship-care-plan","proton-therapy"],"targets":[],"drugs":["pilocarpine","amifostine"],"companies":[],"institutions":[],"pathways":[],"terms":["mucositis","late-effects"],"trials":[],"people":[],"bottlenecks":["b-toxicity-qol","b-survivorship"],"keyPapers":[],"journals":[],"dependsOn":[],"notes":[],"principle":"Serous acinar cells of the parotid are among the most radiosensitive tissues in the body, and mean parotid dose predicts long-term flow. Sparing the contralateral parotid below a threshold dose preserves stimulated flow that recovers over months. Saliva is also the mouth's buffering and remineralising system, so losing it causes a distinctive pattern of caries at the tooth necks, and irradiated bone has reduced vascularity and healing capacity.","strengths":["Randomised evidence that modulated radiotherapy halves lasting dryness and allows saliva recovery","Pilocarpine has a placebo-controlled trial behind it","Pre-treatment dental assessment prevents the worst complication"],"limitations":["Taste change has no treatment with reliable evidence and no verified recovery curve","Pilocarpine causes sweating and a substantial minority stop it","Dental access and funding for lifelong review are inconsistent"]},"route":"/technologies/dry-mouth-teeth-after-head-neck-radiotherapy/","neighbours":{"idea":[{"id":"idea-moon-mucositis-taste-programme","kind":"idea","name":"Photobiomodulation and a taste and swallowing programme for mouth and throat toxicity","route":"/ideas/idea-moon-mucositis-taste-programme/"}],"cancer":[{"id":"head-and-neck","kind":"cancer","name":"Head and neck squamous cell carcinoma","route":"/cancers/head-and-neck/"},{"id":"thyroid","kind":"cancer","name":"Thyroid cancer","route":"/cancers/thyroid/"}],"section":[{"id":"radiation","kind":"section","name":"Radiation Therapy","route":"/fronts/radiation/"},{"id":"rejuvenation","kind":"section","name":"Recovery & Rejuvenation","route":"/fronts/rejuvenation/"},{"id":"supportive-care","kind":"section","name":"Supportive Care & Survivorship","route":"/fronts/supportive-care/"}],"technology":[{"id":"rejuv-mind-visible-difference-head-and-neck","kind":"technology","name":"A changed face and voice: body image after head and neck cancer treatment","route":"/technologies/rejuv-mind-visible-difference-head-and-neck/"},{"id":"acupuncture-xerostomia","kind":"technology","name":"Acupuncture for dry mouth after head and neck radiotherapy","route":"/technologies/acupuncture-xerostomia/"},{"id":"gvhd-organ-by-organ","kind":"technology","name":"Chronic GvHD organ by organ: skin, mouth, eyes, gut, liver, joints and genital tract","route":"/technologies/gvhd-organ-by-organ/"},{"id":"hyperbaric-oxygen-radiation-injury","kind":"technology","name":"Hyperbaric oxygen for late radiation injury","route":"/technologies/hyperbaric-oxygen-radiation-injury/"},{"id":"imrt-igrt","kind":"technology","name":"IMRT / IGRT (modern external beam)","route":"/technologies/imrt-igrt/"},{"id":"oral-cryotherapy-mucositis","kind":"technology","name":"Oral cryotherapy (ice chips) to prevent mucositis","route":"/technologies/oral-cryotherapy-mucositis/"},{"id":"photobiomodulation-mucositis","kind":"technology","name":"Photobiomodulation (low-level laser) for oral mucositis","route":"/technologies/photobiomodulation-mucositis/"},{"id":"proton-therapy","kind":"technology","name":"Proton therapy","route":"/technologies/proton-therapy/"},{"id":"survivorship-care-plan","kind":"technology","name":"Survivorship care and late-effects surveillance","route":"/technologies/survivorship-care-plan/"},{"id":"rejuv-paed-teeth-and-face","kind":"technology","name":"Teeth, jaws and facial growth after treatment in childhood","route":"/technologies/rejuv-paed-teeth-and-face/"}],"drug":[{"id":"amifostine","kind":"drug","name":"Amifostine","route":"/drugs/amifostine/"},{"id":"pilocarpine","kind":"drug","name":"Pilocarpine","route":"/drugs/pilocarpine/"}],"term":[{"id":"late-effects","kind":"term","name":"Late effects and survivorship toxicity","route":"/terms/late-effects/"},{"id":"mucositis","kind":"term","name":"Mucositis and stomatitis","route":"/terms/mucositis/"}],"bottleneck":[{"id":"b-survivorship","kind":"bottleneck","name":"Survivorship and late effects are neglected","route":"/bottlenecks/b-survivorship/"},{"id":"b-toxicity-qol","kind":"bottleneck","name":"Toxicity and quality of life are undervalued","route":"/bottlenecks/b-toxicity-qol/"}]}}