Sensitive Teeth — Symptoms, Causes & Treatment | MyMedicPlus

Dentinal hypersensitivity (sensitive teeth) is a sharp, transient dental pain triggered by thermal, osmotic, evaporative, or tactile stimuli, not attributable to any other dental defect or disease. Affects 11-33% of adults, most commonly aged 20-40. It is a symptom of exposed dentinal tubules transmitting stimuli to the dental pulp — explained by the hydrodynamic theory (Brannstrom, 1963): stimuli cause rapid fluid movement in the dentinal tubules, displacing mechanoreceptors in the pulp and triggering a sharp pain response. Cold is the most commonly reported trigger (up to 75% of cases), followed by sweet or sour stimuli, touch, and heat. The mandibular and maxillary premolars are most frequently affected. Sensitive teeth frequently coexists with enamel erosion, gum recession, and bruxism — these underlying causes must be addressed for lasting relief. Severity ranges from mild occasional sensitivity to debilitating pain affecting daily food choices and oral hygiene.

Sensitivity arises when dentinal tubules are exposed due to: enamel erosion (acid reflux/GERD, dietary acids, carbonated drinks, eating disorders such as bulimia nervosa — which causes broad multisurface erosion from frequent gastric acid exposure), gum recession (exposing root dentine, which naturally lacks protective enamel), bruxism/tooth grinding (enamel wear and cusp fractures), aggressive brushing with a stiff brush or abrasive toothpaste, excessive or repeated tooth whitening, cracked teeth (particularly cracks extending to the dentine-pulp interface), and recent dental procedures (scaling, root planing, bleaching, crown preparation). Periodontal disease is a major cause in adults over 40 — gum inflammation and disease cause progressive gingival recession exposing root surfaces that contain up to eight times more open dentinal tubules than cervical enamel, dramatically increasing sensitivity. Dentinal tubule diameter and permeability increase with proximity to the pulp, explaining why sensitivity worsens as the underlying cause progresses.

Sharp, sudden, shooting dental pain in response to cold foods/drinks (most common trigger), heat, sweet or acidic foods, cold air, or dental probing. Pain is brief (seconds to minutes) and stops when the stimulus is removed — this cessation on removal is a key distinguishing feature from pulpitis. It typically affects multiple teeth simultaneously, most commonly the premolars and canines. Pain from simple sensitivity is disproportionately intense relative to the innocuous stimulus but short-lived. Persistent spontaneous pain (throbbing pain at rest, not provoked by stimuli) suggests irreversible pulpitis rather than simple sensitivity and requires root canal assessment. Pain that lingers for 15–30 seconds after the cold stimulus is removed indicates reversible pulpitis — treatment of the underlying cause may resolve it. Sensitivity involving only one tooth, especially with a history of deep filling, dental trauma, or crack, requires individual tooth assessment to exclude a more serious cause.

Clinical history and examination identify exposed dentine surfaces. Evaporative air blast test (dentist's air syringe for 1 second) and cold test (ice stick or cold ethyl chloride spray) reproduce sensitivity. VAS (Visual Analogue Scale, 0-10) and the Schiff Cold Air Sensitivity Scale (0-3) quantify pain severity for monitoring treatment response. Dental X-rays (periapical and bitewing) detect associated caries, cracks, or periapical pathology. Periodontal probing and recession measurement (using a graduated periodontal probe) assess the extent of gum recession contributing to exposed root surfaces. Differential diagnosis is essential: the dentist must exclude dental caries (detected by probing and X-rays), cracked tooth syndrome (pain on biting or releasing bite — detected by biting on a Tooth Sleuth device), reversible pulpitis (cold pain lingering more than 15 seconds after stimulus), and irreversible pulpitis (spontaneous throbbing pain, severe response to cold, no relief after stimulus removed — requires root canal treatment). Transillumination and magnification identify enamel cracks not visible to the naked eye.

Desensitizing toothpaste (potassium nitrate 5% — blocks neural transmission by depolarising pulp nerve fibres; stannous fluoride or NovaMin/hydroxyapatite — physically occludes dentinal tubules) used twice daily and applied with a fingertip to the sensitive area for 1 minute without rinsing maximises benefit. In-office treatments: fluoride varnish (5% sodium fluoride) applied by a dentist forms calcium fluoride crystals occluding tubules — provides relief for 4–6 months; bonding agents (single-component light-cured resins) seal tubules for 6–12 months per application; potassium oxalate and glutaraldehyde solutions precipitate calcium crystals in tubule openings. Nd:YAG laser or Er:YAG laser therapy: thermally and mechanically occludes dentinal tubules — provides 6–12 months of significant relief per treatment. For severe recession: connective tissue graft (gold standard) or free gingival graft surgically covers exposed root surfaces — definitive treatment preventing further recession and resolving sensitivity. Treat underlying causes: custom night guard for bruxism, GERD treatment (proton pump inhibitors), gum disease management, and avoidance of toothbrush abrasion.

Persistent untreated sensitivity causes significant impact on diet quality (avoidance of cold drinks, ice cream, citrus fruits, and hot beverages leads to nutritional compromise), oral hygiene habits (avoiding brushing sensitive areas allows plaque accumulation, periodontal disease, and accelerated recession — worsening the original cause), and psychological wellbeing (dental anxiety and avoidance of dental care is common). Unidentified underlying dental caries or tooth cracks, if untreated, progress to irreversible pulpitis or periapical abscess requiring root canal treatment or extraction. Sensitivity from GERD or bulimia nervosa, if untreated, causes progressive tooth erosion with eventual loss of occlusal height and the need for full-mouth reconstruction. Gingival recession progression eventually exposes the root to a degree where gingival grafting becomes necessary for adequate tooth prognosis and root coverage.

Use a soft-bristled or electric toothbrush with gentle circular or modified Bass technique and light pressure — excessive brushing force is the most common preventable cause of gingival recession and enamel abrasion leading to dentinal hypersensitivity; electric oscillating-rotating toothbrushes remove more plaque with less user-applied pressure than manual brushes. Avoid brushing immediately after consuming acidic foods or drinks: the salivary buffering period for enamel remineralisation takes approximately 30 minutes after acid exposure — brushing within this window causes abrasion of acid-softened enamel; rinse with water and chew sugar-free xylitol gum (stimulates saliva flow and accelerates pH recovery) immediately after consuming acids. Use fluoride-containing desensitizing toothpaste twice daily (potassium nitrate 5% blocks neural transmission to pulp nerve fibres; stannous fluoride, NovaMin, or hydroxyapatite physically occlude dentinal tubules) — apply a pea-sized amount directly to the sensitive area with a fingertip for one minute without rinsing to maximise tubule occlusion benefit. Treat gastroesophageal reflux disease (GERD) with proton pump inhibitors (omeprazole 20-40 mg daily) and lifestyle measures (avoid lying down within 2 hours of meals, elevate bed head by 15-20 cm, avoid trigger foods) — untreated GERD causes progressive palatal surface enamel erosion and dentinal exposure over years. Manage bruxism (nocturnal tooth grinding) with a custom-fitted hard acrylic occlusal splint (night guard) fabricated by a dentist — protects enamel and reduces jaw muscle loading; manage contributing stress and anxiety. Reduce dietary acid consumption: limit fizzy drinks, citrus juices, sports drinks, and vinegar-based foods; use a straw for acidic drinks; rinse with water afterwards; choose still fluoridated water between meals. Attend 6-monthly dental check-ups for early detection of enamel erosion, gingival recession, carious lesions, and toothbrush abrasion before they progress to irreversible pulpitis.

See a dentist for: new tooth sensitivity lasting more than 2-4 weeks; sensitivity that is worsening despite using desensitizing toothpaste; multiple sensitive teeth (may indicate systemic enamel erosion from acid reflux or dietary acids requiring medical review); or sensitivity after a dental procedure persisting beyond 4-6 weeks (may indicate pulpitis requiring root canal assessment). Seek emergency dental care for: severe spontaneous toothache that is not triggered by stimuli but occurs at rest, particularly if throbbing and waking you at night — this is a sign of irreversible pulpitis or periapical abscess, not simple sensitivity; swelling of the gum or face around a tooth; difficulty opening the mouth or swallowing (spreading dental infection); and high fever with a painful tooth (Ludwig's angina risk — a life-threatening spreading infection of the floor of the mouth requiring emergency hospital admission). Do not self-treat spontaneous, severe, or progressive dental pain with topical anaesthetics — these may mask progression of serious dental pathology.