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entine hypersensitivity (DH) is a frequent dental complaint noted in adult population.1 It can be defined as a sharp pain of short duration initiating from dentine which occurs when exposed to the external stimuli such as heat, cold, touch or chemical.2 The occurrence of dentine hypersensitivity increases from 30-40 years of age. Additionally, females are more commonly affected as compare to males.3,4 The main causes of dentin hypersensitivity are vigorous brushing, intake of citric food, and grinding of teeth due to stress.5 Countless surveys have revealed that the exposure of root surfaces and recession of gingival tissue permits extra fast exposure of dentinal tubules as the thin layer of cementum covering the root gets detached effortlessly and causes sensitivity.6 Cold and hot stimulus are the most common stimuli, whereas dietary acid has important role in evoking Dentine Hypersensitivity.7 Three main theories of dentin hypersensitivity have been suggested: The first theory; Direct Innervation Theory, stated that the nerve's endings penetrates the dentine and extends to pulp and mechanical stimulation initiates the pain, but there is lack of proof to verify this theory.8,9 Second acclaimed theory is the Odontoblast Receptor theory, in this odontoblasts works as pain receptors and sends pain signals to pulpal nerve endings. However this theory has also been discarded as the nerve impulses are not produced and doesn’t get stimulated by the cellular matrix of odontoblasts. Third theory is the Hydrodynamic Theory which is commonly accepted theory. It describes the fluid movement within the 1. Assistant Professor, Department of Oral Biology, Bahria University Medical and Dental College. 2 .Lecturer, Department of Oral Biology, Bahria University Medical and Dental College. 3. Assistant Professor, Head of Department Oral Biology, Rawal Institute of Health Sciences. 4. Assistant Professor, Department of Dental Materials, Jinnah Sindh Medical University. Corresponding author: “Dr. Beenish Fatima Alam ” < nish_alam@yahoo.com >

Dentine Hypersensitivity and Its Associated Factors: A Cross-Sectional Study Conducted on Patients Visiting Dental Hospital of Karachi, Pakistan