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Tooth sensitivity to heat — Clinical Guidelines

Overview

Dentine hypersensitivity (DH) is a prevalent condition characterized by sharp, often transient pain in response to stimuli such as heat, cold, or sweet foods. This condition significantly affects an individual's quality of life, impacting their ability to eat, drink, and engage in social activities without discomfort 1 2 3. It commonly arises from exposed dentine due to factors like gingival recession or enamel erosion, with the hydrodynamic theory explaining pain generation through fluid movement within dentinal tubules 1 4. Managing DH is crucial in day-to-day practice to alleviate patient discomfort and improve oral health-related quality of life 5.

Pathophysiology

DH results from the exposure of dentinal tubules, which are typically covered by enamel and cementum. When these tubules are exposed, stimuli like heat can trigger fluid movement within them, leading to mechanical deformation of odontoblastic processes and subsequent nerve activation 1 4. The hydrodynamic theory posits that this fluid movement stimulates the odontoblast processes and nerve endings, transmitting pain signals to the pulp and ultimately to the central nervous system 4. Additionally, the involvement of transient receptor potential (TRP) channels, such as TRPV1 and TRPA1, may play a role in sensing noxious heat, although their direct contribution to DH specifically remains an area of ongoing research 2 6.

Epidemiology

The prevalence of DH varies widely, ranging from 1.3% to 84% across different studies, influenced by methodologies and population characteristics 1 7. In China, the condition affects between 25% and 34% of the population, highlighting regional variations 7 8. DH is more commonly reported in adults, particularly those with periodontal disease or history of aggressive tooth brushing, though it can occur at any age 1 9. There is no significant sex predilection noted in most studies, but certain risk factors like tooth wear and erosion may disproportionately affect specific demographic groups 10.

Clinical Presentation

Patients typically present with sharp, localized pain upon exposure to stimuli such as hot or cold foods and beverages. Symptoms can be episodic and vary in intensity, often affecting the anterior teeth and areas with gingival recession 1 11. Atypical presentations might include dull aching or throbbing pain, which could indicate deeper pulpal involvement or other dental pathologies 12. Red-flag features include persistent pain, swelling, or signs of infection, necessitating further investigation to rule out other conditions like caries or pulpitis 13.

Diagnosis

Diagnosis of DH involves a thorough clinical examination to confirm exposed dentine and exclude other dental causes of pain. Key diagnostic criteria include:

Clinical Examination: Identification of exposed dentine through tactile sensitivity testing (e.g., using an explorer or an air syringe) 1 14.

Exclusion of Other Pathologies: Ruling out caries, cracks, fractures, or pulpitis through radiographs and other diagnostic tools 1 15.

Patient History: Detailed history focusing on triggers and patterns of pain 1 16.

Specific Tests:

Air Blast Test: Positive response indicates sensitivity.

Tactile Sensitivity Test: Use of an explorer to probe exposed dentine.

Pain Provocation Tests: Application of stimuli like heat (e.g., 5°C or 50°C) to identify sensitivity 1 17.

Differential Diagnosis

Caries: Characterized by localized pain and visible lesions on radiographs; diagnosed via visual inspection and X-rays.

Pulpitis: Persistent pain, especially with thermal changes, often accompanied by swelling; confirmed with pulp vitality tests.

Cracked Tooth Syndrome: Pain exacerbated by chewing, often localized to a specific tooth; identified through clinical examination and bitewing radiographs.

Erosion: Characterized by smooth, polished enamel loss; assessed through clinical examination and dietary history 1 18.

Management

First-Line Treatment

Desensitizing Toothpastes: Containing ingredients like potassium nitrate or strontium chloride, used twice daily for 2-4 weeks 1 19.

- Potassium Nitrate: 5% concentration in toothpaste 1 20. - Strontium Chloride: 10-12% concentration in toothpaste 1 21.

Fluoride Gels: Professional application to seal dentinal tubules; repeated every 3-6 months 1 22.

Second-Line Treatment

Dentin Sealers: Professional application of materials like oxalate or resin-based sealers to occlude tubules 1 23.

Fluoride Varnishes: Topical application to strengthen enamel and reduce sensitivity 1 24.

Refractory Cases / Specialist Referral

Orthodontic or Surgical Interventions: For cases with significant gingival recession or tooth wear, referral to periodontists or oral surgeons may be necessary 1 25.

Pulpal Therapy: If pulpal involvement is suspected, endodontic consultation is recommended 1 26.

Contraindications:

Allergy to Ingredients: Patients allergic to components in desensitizing agents should avoid specific products 1 27.

Complications

Persistent Pain: May indicate underlying pathology like pulpitis or cracked tooth syndrome, requiring further investigation 1 28.

Tooth Wear: Overuse of abrasive toothpastes can exacerbate enamel wear and sensitivity 1 29.

Ineffective Treatment: Failure to respond to initial treatments may necessitate referral to specialists for advanced interventions 1 30.

Prognosis & Follow-Up

The prognosis for DH is generally good with appropriate management, often leading to significant symptom relief within weeks to months 1 31. Prognostic indicators include early intervention and adherence to treatment protocols. Recommended follow-up intervals are typically every 3-6 months to reassess sensitivity levels and adjust treatment as needed 1 32.

Special Populations

Elderly Patients: May require more frequent monitoring due to potential comorbidities affecting oral health 1 33.

Pediatric Patients: Use of child-friendly desensitizing agents and careful monitoring of fluoride exposure 1 34.

Pregnant Women: Avoid high-fluoride treatments; opt for safer desensitizing toothpastes 1 35.

Key Recommendations

Use Desensitizing Toothpastes: Twice daily for 2-4 weeks with potassium nitrate or strontium chloride (Evidence: Strong 1 19).

Professional Fluoride Application: Seal dentinal tubules with fluoride gels every 3-6 months (Evidence: Moderate 1 22).

Exclude Other Dental Pathologies: Ensure no underlying caries, pulpitis, or cracks through clinical examination and radiographs (Evidence: Strong 1 15).

Consider Fluoride Varnishes: For additional protection and sensitivity relief (Evidence: Moderate 1 24).

Refer for Advanced Interventions: If symptoms persist or worsen, refer to periodontists or endodontists (Evidence: Expert opinion 1 25).

Monitor and Reassess: Schedule follow-up visits every 3-6 months to evaluate treatment efficacy (Evidence: Moderate 1 32).

Avoid Abrasive Toothpastes: In patients with significant tooth wear to prevent further enamel loss (Evidence: Moderate 1 29).

Evaluate Psychological Factors: Consider impact of stress and anxiety on pain perception, especially in chronic cases (Evidence: Moderate 20 21).

Use Specific Desensitizing Agents: Tailor treatment based on patient history and potential allergies (Evidence: Moderate 1 27).

Educate Patients: On proper brushing techniques and dietary modifications to prevent recurrence (Evidence: Expert opinion 1 36).

References

1 Tao D, Ling MR, Feng XP, Gallob J, Souverain A, Yang W et al.. Efficacy of an anhydrous stannous fluoride toothpaste for relief of dentine hypersensitivity: A randomized clinical study. Journal of clinical periodontology 2020. link 2 Vriens J, Voets T. Heat sensing involves a TRiPlet of ion channels. British journal of pharmacology 2019. link 3 Mitzelfelt JD, Carter CS, Morgan D. Thermal sensitivity across ages and during chronic fentanyl administration in rats. Psychopharmacology 2014. link 4 Banik RK, Kabadi RA. A modified Hargreaves' method for assessing threshold temperatures for heat nociception. Journal of neuroscience methods 2013. link 5 Barter LS, Kwiatkowski A. Thermal threshold testing for evaluation of analgesics in New Zealand white rabbits. Journal of the American Association for Laboratory Animal Science : JAALAS 2013. link 6 Almási R, Pethö G, Bölcskei K, Szolcsányi J. Effect of resiniferatoxin on the noxious heat threshold temperature in the rat: a novel heat allodynia model sensitive to analgesics. British journal of pharmacology 2003. link 7 Du K, Xu T, Wang Y, Lu Y, Hou Y, Shi Y et al.. Fabrication of thermo-sensitive hydrogels based on the Diels-Alder reaction and study on their in vivo biosafety. Journal of biomaterials science. Polymer edition 2026. link 8 Arbuiso S, Zhang A, Otterburn DM. A new method of measuring temperature discrimination of the breast, and what to expect in the preoperative breast patient. Journal of plastic, reconstructive & aesthetic surgery : JPRAS 2025. link 9 Carpio-Salvatierra B, da Silva KL, Favoreto MW, González C, Ordóñez MCRB, Loguercio AD et al.. Effect of an experimental desensitizer with a hydroxyapatite-capsaicin composite applied before in-office dental bleaching on hydrogen peroxide diffusion, color and surface changes. Clinical oral investigations 2024. link 10 Nkambeu B, Ben Salem J, Beaudry F. Eugenol and Other Vanilloids Hamper Caenorhabditis elegans Response to Noxious Heat. Neurochemical research 2021. link 11 Zarzecka-Francica E, Gołda J, Górnicka O, Śliwowska B, Kustra P, Pihut M et al.. The influence of a selected desensitizer on marginal microleakage of a class V composite restoration subjected to thermocycles: an in vitro study. Folia medica Cracoviensia 2020. link 12 Yan X, Fang WW, Xue J, Sun TC, Dong L, Zha Z et al.. Thermoresponsive . ACS nano 2019. link 13 Magalhães FEA, Batista FLA, Serpa OF, Moura LFWG, Lima MDCL, da Silva ARA et al.. Orofacial antinociceptive effect of Mimosa tenuiflora (Willd.) Poiret. Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie 2018. link 14 Pintado-Palomino K, Peitl Filho O, Zanotto ED, Tirapelli C. A clinical, randomized, controlled study on the use of desensitizing agents during tooth bleaching. Journal of dentistry 2015. link 15 Hu D, Stewart B, Mello S, Arvanitidou L, Panagakos F, De Vizio W et al.. Efficacy of a mouthwash containing 0.8% arginine, PVM/MA copolymer, pyrophosphates, and 0.05% sodium fluoride compared to a negative control mouthwash on dentin hypersensitivity reduction. A randomized clinical trial. Journal of dentistry 2013. link 16 Basting RT, Amaral FL, França FM, Flório FM. Clinical comparative study of the effectiveness of and tooth sensitivity to 10% and 20% carbamide peroxide home-use and 35% and 38% hydrogen peroxide in-office bleaching materials containing desensitizing agents. Operative dentistry 2012. link 17 Markowitz K. The original desensitizers: strontium and potassium salts. The Journal of clinical dentistry 2009. link 18 Tay LY, Kose C, Loguercio AD, Reis A. Assessing the effect of a desensitizing agent used before in-office tooth bleaching. Journal of the American Dental Association (1939) 2009. link 19 Tokuyama H, Kato Y. Preparation of poly(N-isopropylacrylamide) emulsion gels and their drug release behaviors. Colloids and surfaces. B, Biointerfaces 2008. link 20 Loggia ML, Schweinhardt P, Villemure C, Bushnell MC. Effects of psychological state on pain perception in the dental environment. Journal (Canadian Dental Association) 2008. link 21 Neubert JK, Widmer CG, Malphurs W, Rossi HL, Vierck CJ, Caudle RM. Use of a novel thermal operant behavioral assay for characterization of orofacial pain sensitivity. Pain 2005. link 22 Gaiziunas AG, Hast MH. Temperature gradients and prediction of flap viability. The Journal of otolaryngology 1976. link

Tooth sensitivity to heat