The tooth has a complex of nerves that give it the necessary sensory supply, these nerves are closely related to the hard shell-like structure of the teeth, due to exterior damage which may be due to aggressive brushing, excessive acid insults of carbonated drinks, Reflux disorders causing acidity, etc. the outer shell gets eroded exposing the inner tubules to the oral environment. When the oral environment experiences stimuli like hot, cold, sweet, sour taste, the nerve endings are irritated and the patient experiences sensitivity. Can this be treated, Yes it is treatable. Some patients require conservative treatments like the use of anti-hypersensitivity toothpastes which form a barrier of fluoride minerals over the hard shell of the tooth and block these impulses. Some patients require a more direct approach which involves dental office treatments of applications of anti-hypersensitivity varnishes and restorative materials.