# Root Caries Management > Root caries management for BDS Operative Dentistry — xerostomia and recession risks, active versus arrested lesions, GIC preference and fluoride care. - Canonical URL: https://prepelephant.com/topics/bds/operative-dentistry/root-caries-management - Exam / course: BDS · Subject: Operative Dentistry - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Root Caries Management", PrepElephant, https://prepelephant.com/topics/bds/operative-dentistry/root-caries-management ## Direct answer Root caries is a disease of recession plus xerostomia: when the gingiva retreats, cementum sits in the plaque zone, and a dry mouth — most often the side effect of the antihypertensives, antidepressants and antihistamines that ageing patients take for granted — removes the saliva that would have buffered it. The lesion is a softened, yellowish or light-brown area at or below the cemento-enamel junction; a hard, dark, shiny lesion is arrested and needs no restoration. Management mirrors that distinction: prevention and remineralisation for active non-cavitated lesions, and restoration only when cavitation or function demands it — with glass ionomer the material of choice on root surfaces for its chemical bond to cementum and dentine and its fluoride release. ## What you must remember - **Risk profile (viva favourite):** age with recession, xerostomia from polypharmacy, poor plaque control, and dietary carbohydrate — the geriatric restorative triad, aggravated by radiotherapy and Sjögren syndrome. - **Active versus arrested:** active root caries is soft or leathery, yellowish-light brown, often covered by plaque; arrested caries is hard, dark brown-black, shiny — leave the arrested lesion alone and manage its risk. - **Diagnosis:** visual and tactile with a gentle probe at the CEJ; radiographs help where the lesion hides cervically, and bitewings of denture-bearing ridges are checked routinely. - **Non-cavitated management:** fluoride — 5 percent sodium fluoride varnish applications at 3-6 month intervals for high-risk patients, and 5000 ppm fluoride dentifrice prescriptions — remineralise and harden the lesion. - **Material of choice:** glass ionomer (conventional or resin-modified) bonds chemically to cementum and dentine, releases fluoride, tolerates moisture during setting — ideal on root surfaces where isolation is hard. - **When composite:** aesthetic zones and moisture-controllable fields, with enamel bevelled where a margin lands on enamel and no bevel on cementum, which lacks the prism structure to etch. - **Saliva management:** for xerostomic patients — sialagogues, frequent sips, alcohol-free chlorhexidine or saliva substitutes — because restoring without managing the dry mouth invites recurrence. ## Managing a retired teacher's root lesions A 68-year-old on two antihypertensives presents with recession and multiple cervical lesions: a soft, light-brown lesion at the mesiobuccal 13, a shallow hard black lesion at 34, and a cavitated leathery lesion at the 46 root surface carrying occlusal load. Three lesions, three rungs of the same ladder. The 13 lesion is active but non-cavitated: fluoride varnish now and at three months, 5000 ppm toothpaste prescribed, salivary substitutes discussed with the physician's awareness — no restoration. The 34 lesion is arrested: hard, dark, cleanable — photographed, documented, and left, with the patient taught that its colour is a scar, not an active disease. The 46 root lesion is cavitated, soft, and subject to masticatory load, so it is restored: rubber dam where the recession allows, carious cementum and dentine removed with a slow-speed round bur, and a resin-modified glass ionomer placed — chosen over composite because isolation at that cervical margin is imperfect and the chemical bond plus fluoride release serve a xerostomic mouth better. Recall is three-monthly with varnish, because the risk profile — recession, polypharmacy, dry mouth — is permanent even after the lesions are treated. ## Where students slip The classic error is restoring every discoloured root surface: cutting into an arrested lesion creates a cavity in cementum that never heals, and examiners present exactly this dark-but-hard case to catch the reflex. The viva trap is material justification — students name GIC for root caries but lose marks until they give the three reasons: chemical adhesion to cementum, fluoride release, and moisture tolerance during setting. Another documented confusion is bevel logic: enamel margins are bevelled, cementum margins are not, because etching does not create prism microporosity in cementum. The xerostomia question is the third standard probe — the answer expected is the polypharmacy link and saliva's buffering role, not a list of lozenges. ## Frequently asked questions ### Why is root caries common in elderly patients? Gingival recession exposes cementum to plaque, and polypharmacy-induced xerostomia removes the saliva that buffers acid, combining exposure with reduced protection. ### How is an arrested root caries lesion recognised? It is hard, dark brown to black, and shiny — a remineralised scar that requires risk management and monitoring rather than restoration. ### Why is glass ionomer preferred for root surface restorations? It bonds chemically to cementum and dentine, releases fluoride locally, and tolerates the moisture that cervical margins rarely escape. ### What fluoride regimens suit high-risk root caries patients? 5 percent sodium fluoride varnish at 3-6 monthly intervals with 5000 ppm prescription dentifrice for daily use, per current preventive guidance. ### Should cementum margins be bevelled like enamel? No — cementum lacks prismatic structure, so etching cannot create the microporosity a bevel exploits; enamel margins alone are bevelled.