Sensitivity Protection Zero Alcohol Shields & Protects Sensitive Areas of Teeth For a 24-Hour Relief* from Painful Tooth Sensitivity What is Tooth sensitivity? Tooth sensitivity is a short, sharp pain resulting from stimuli - including heat, cold, acid, or sugar - increasing fluid flow inside exposed dentin tubules which is transmitted to the nerve endings located in the pulp. In a healthy mouth, the dentin tubules are covered by gum tissue or enamel. Reported prevalence varies widely with some studies indicating up to 74% of the population suffers from tooth sensitivity. Whether it is every day or occasionally, having sensitive teeth makes eating or drinking painful.