With regular brushing: Fights cavities. Leaves teeth feeling clean. Builds increasing protection against tooth sensitivity to: Cold, heat, acids, sweets, contact. Powerful formula builds increasing protection against sensitive tooth pain with regular use. Dentin, which surrounds the pulp cavity and tooth nerves, can become exposed when gums recede, causing sensitive teeth. Crest Sensitivity Protection helps relieve the pain of sensitive teeth by soothing the nerves in your teeth where dentin is exposed. For healthy teeth, brush twice a day, floss daily and visit your dentist regularly.