Sensitive Teeth (Dentine Hypersensitivity) — Causes, Symptoms & Treatment Guide — Symptoms, Causes & Treatment | MyMedicPlus

Dentine hypersensitivity (DH), commonly referred to as sensitive teeth, is characterised by a short, sharp pain arising from exposed dentine in response to thermal (cold most commonly, heat), evaporative (air blast), tactile (toothbrushing), osmotic (sweet or salty foods), or chemical (acidic) stimuli, that is not attributable to any other dental defect or pathology. Dentine is the calcified tissue beneath tooth enamel and cementum, containing microscopic tubules (dentinal tubules — 1-2 micrometres in diameter) filled with fluid and odontoblastic processes that run from the pulp to the outer surface. The hydrodynamic theory (Brannstrom) explains DH: exposure of dentine tubules to stimuli causes fluid movement within the tubules, activating A-delta nerve fibres at the pulp-dentine junction, triggering sharp pain. Approximately 11.5-33% of adults experience dentine hypersensitivity — making it one of the most prevalent dental complaints. Sensitivity disproportionately affects upper canines and first premolars, particularly at the cervical margin (gum line). It significantly impacts quality of life through avoidance of cold drinks, ice cream, and certain foods.

Dentine hypersensitivity requires two conditions: dentine exposure (loss of overlying enamel or cementum) and patent (open) dentinal tubules. Enamel erosion: dietary acid (carbonated drinks, fruit juice, citrus fruits, vinegar-based foods, energy drinks) and gastric acid (gastro-oesophageal reflux disease, bulimia nervosa — erodes palatal surfaces) dissolves enamel, exposing dentine. Gum (gingival) recession: the most common cause of cervical dentine exposure — the gum margin recedes, exposing the cementum-covered root surface (cementum wears rapidly leaving tubules open); caused by aggressive toothbrushing (horizontal scrubbing technique), periodontitis, gingival trauma, orthodontic treatment, and anatomical gum biotype. Enamel abrasion: mechanical wear from toothbrushing (particularly with medium or hard bristles and abrasive toothpaste), bruxism (tooth grinding), and abrasive foods. Dental procedures: scaling and root planing, tooth whitening, crown preparation, and enamel shaping can temporarily expose dentine tubules — typically resolves within 2-4 weeks. Tooth cracks and fractures. Dental caries (cavities) exposing dentine.

The hallmark symptom is a sharp, short-duration pain (seconds to tens of seconds) provoked by specific stimuli — distinguishing it from the prolonged spontaneous pain of pulpitis (nerve inflammation from deep decay). Cold stimuli are the most common and distressing trigger: cold beverages, ice cream, cold air on a cold day. Other triggers: hot drinks (tea, coffee), sweet foods (chocolate, sweets), acidic foods and drinks (citrus, vinegar, soda), toothbrushing pressure and bristle contact, and dental probing during examination. Symptom variability: some patients experience mild discomfort; others find the sharp electric-shock pain so severe that it dramatically restricts diet (avoiding cold drinks, ice cream, raw vegetables) and interferes with eating, drinking, and oral hygiene. Severity fluctuates — can worsen during periods of intense acid exposure or gum recession progression. Spontaneous pain (pain without stimulus) is NOT a feature of dentine hypersensitivity — if present, it suggests irreversible pulpitis, requiring root canal treatment or extraction. Location: most often at the gum line (cervical region) of upper canines and premolars — these teeth are most prone to gingival recession.

Diagnosis of dentine hypersensitivity is clinical — made by a dentist after excluding other causes of tooth pain. Key diagnostic steps: detailed symptom history (type of stimulus, duration of pain, location, severity — Schiff sensitivity scale or Visual Analogue Scale/VAS used to quantify); clinical examination — identifying visible gum recession (measured with a periodontal probe), enamel erosion patterns, wear facets (bruxism), enamel defects, and carious lesions; evaporative test (dental air blast — most reliable stimulus for DH diagnosis — standardised with 1-second air blast from dental syringe at 20-70°C), cold test (ethyl chloride or ice), tactile probing. Periapical X-rays (bitewing radiographs): assess bone levels, interproximal caries, and periapical status. Differentials that must be excluded: dental caries (cavity — responds more to sweet stimuli, longer-lasting pain, visible lesion); cracked tooth syndrome (pain on biting or release); reversible pulpitis (mild inflammation — heat and cold sensitivity, lingering seconds to minutes); irreversible pulpitis (spontaneous throbbing pain, lingering minutes to hours from thermal stimuli — requires root canal treatment); and enamel hypoplasia (developmental defect).

At-home treatments: desensitising toothpastes (first-line — twice daily use with a soft-bristle toothbrush). Two main mechanisms: potassium nitrate (5% — depolarises pulpal nerve fibres reducing pain signalling; takes 4-8 weeks to reach full effect); stannous fluoride (SnF2 — occludes dentinal tubules by forming a precipitate; faster onset); arginine-calcium carbonate toothpastes (Colgate Sensitive Pro-Relief — effectively occludes tubules). Application technique: apply to sensitive areas with fingertip after brushing, do not rinse — increases contact time and efficacy. Fluoride mouthwash reduces acid dissolution of enamel and provides additional tubule occlusion. Dietary modification: reduce acid consumption (fizzy drinks, citrus juices); avoid acidic food or drink within 30-60 minutes of toothbrushing (acid softens enamel, making it more susceptible to abrasion). Professional treatments (dentist-applied): high-concentration fluoride varnish (2.26% fluoride — Duraphat, Colgate PreviDent); Gluma desensitiser (glutaraldehyde + HEMA — effective tubule occlusion); bonding agents and dental sealants sealing tubule openings; Nd:YAG laser and diode laser desensitisation; dentine bonding resin composite restorations for severely eroded cervical areas. For gum recession causing significant dentine exposure: connective tissue graft (subepithelial graft — gold standard for root coverage); free gingival graft; or coronally advanced flap procedures performed by a periodontist — significantly reduces sensitivity by covering the exposed root.

Dentine hypersensitivity itself does not directly cause tooth loss, but the underlying processes driving exposed dentine — if inadequately managed — can progress to serious dental complications. Progressive gum recession leads to increasing root surface exposure, making teeth highly susceptible to root caries (decay on exposed root surfaces, which lack enamel protection) — a leading cause of tooth loss in adults over 50. Enamel erosion, if the acid source is not eliminated (dietary acids, GERD, bulimia nervosa), progresses to significant loss of tooth structure with changes in bite height, tooth shortening, aesthetic impairment, and ultimately pulp exposure causing irreversible pulpitis requiring root canal treatment or extraction. Untreated periodontitis — a common cause of gum recession — is associated with systemic inflammatory conditions including cardiovascular disease, type 2 diabetes, adverse pregnancy outcomes, and respiratory disease. Avoidance behaviour — restricting cold drinks, ice cream, and certain foods due to pain — may impair nutrition, particularly in older adults. Bruxism combined with acid erosion causes marked tooth wear, bite collapse, and temporomandibular joint disorders requiring specialist management. Anxiety around dental visits, if sensitivity leads to avoidance of dental care, permits underlying conditions to worsen substantially, increasing the risk and cost of eventual treatment.

Modify toothbrushing technique: use a soft or ultra-soft bristle brush; gentle circular or modified bass technique rather than aggressive horizontal scrubbing; electric toothbrushes with pressure sensors prevent over-brushing. Wait 30-60 minutes after consuming acidic food or drink before brushing — acid temporarily softens enamel, making it vulnerable to abrasion. Reduce dietary acid exposure: limit carbonated drinks, fruit juices, and acidic foods; use a straw when drinking acidic beverages to reduce enamel contact; neutralise with water or milk immediately after. Treat underlying causes: manage GERD (proton pump inhibitors, dietary modification) to prevent acid erosion; treat bulimia nervosa with psychological and medical support. Bruxism management: custom-made night guard (occlusal splint) to protect enamel from nocturnal grinding. Fluoride supplementation: fluoride varnish application every 3-6 months by a dentist significantly hardens enamel and reduces dentine tubule permeability. Regular dental check-ups every 6 months to detect gum recession early and allow early intervention before significant dentine exposure occurs.

See a dentist promptly for: tooth sensitivity that develops suddenly, is severe, or is rapidly worsening — it may indicate a crack, deep cavity, or beginning of pulpitis requiring urgent treatment; spontaneous, throbbing, or lingering pain lasting more than 30 seconds after the stimulus is removed — this is NOT simple dentine hypersensitivity and may require root canal treatment; visible gum recession that is progressing (gum margin moving upward, exposing more tooth root); sensitivity that does not respond to 4-8 weeks of regular desensitising toothpaste use; or sensitivity accompanied by visible discolouration, swelling, or a gum lump near a tooth. Don't ignore tooth sensitivity — early dental investigation prevents the progression of underlying causes (gum disease, cavities, acid erosion) that become increasingly difficult and expensive to treat.