Dentinal Hypersensitivity is a chronic condition with an acute episode. When dentine is exposed, which usually happens due to Gingival recession & Enamel damage (erosion, abrasion, attrition, and abfraction), external triggers (such as a cold drink) can stimulate the nerves inside the tooth, causing the characteristic short, sharp sensation of tooth sensitivity.1
The most common trigger for realizing sensitivity is cold.