What Causes Tooth Sensitivity?

Generally, tooth sensitivity or sour pain may result from dietary stimulation, mild enamel wear, dental caries, wedge-shaped defects, or periodontitis. If discomfort occurs, it is advisable to seek timely evaluation and treatment at a reputable hospital. A detailed analysis follows:

1. Dietary Stimulation

Frequent consumption of acidic, sweet, or cold foods can transiently stimulate the nerve endings in the superficial dentin layer, causing temporary tooth sensitivity. Reducing intake of acidic, sweet, and cold foods—and rinsing with warm water after meals to remove residual food particles—can help alleviate symptoms.

2. Mild Enamel Wear

Long-term aggressive brushing or habitual chewing of hard objects may gradually wear away the outer enamel layer, resulting in slight dentin exposure. This increases sensitivity to external stimuli, leading to sour or sharp pain. Switching to a soft-bristled toothbrush and adopting gentle, vertical brushing techniques—as well as limiting consumption of hard foods—can help prevent further wear.

3. Dental Caries

Oral bacteria metabolize food debris to produce acidic substances that erode dental tissues. Once dentin is compromised, the underlying pulp nerves become irritated, triggering tooth sensitivity or pain. Under medical guidance, sodium fluoride mouthwash, chlorhexidine gluconate mouthwash, or diboron cream may be used for symptomatic relief; however, when structural damage is evident, restorative filling procedures are required.

4. Wedge-Shaped Defects

Prolonged improper brushing technique combined with localized stress concentration at the cervical region of teeth can cause progressive loss of tooth structure near the gumline, exposing dentin and resulting in persistent sensitivity. Desensitizing toothpaste, compound chlorhexidine mouthwash, or cetylpyridinium chloride mouthwash may be prescribed per physician instructions; for deeper defects, restorative dental procedures are necessary.

5. Periodontitis

Chronic irritation from dental plaque and calculus triggers inflammatory changes in the periodontal tissues, leading to gingival recession and root exposure. This significantly increases tooth sensitivity and results in recurrent sour or sharp pain. Treatment may include oral administration of artificial bezoar and metronidazole capsules, amoxicillin capsules, or roxithromycin capsules under medical supervision; in severe cases, periodontal flap surgery may be indicated.

In daily life, maintain proper brushing habits, practice good oral hygiene, undergo regular professional dental cleanings to remove calculus, limit acidic food intake, schedule routine dental check-ups, and promptly address any dental trauma or structural damage.