Some times enamel on the tooth surface gets atreated or some portion of enamel may chip off this gives stranger rough surface,with little or no sensitivity

Floss at least once a day. Proper flossing removes food particles and plaque from between your teeth. Regularly get a new toothbrush. Change your toothbrush when it becomes frayed, about every three to four months, and choose a soft-bristled toothbrush. Schedule regular dental checkups. See your dentist on a regular basis — generally once or twice a year — to have your teeth or dentures examined and cleaned....