If you have sensitive teeth make sure you are using soft tooth brush. Stop using tartar control formula toothpaste and see if your sensitivity goes away. Evaluate your diet and see if acidic food or drinks are part of your diet and eliminate those.
Dentists can seal the sensitive teeth with the use of fluoride varnishes. Sometimes a sensitive area on the tooth needs to be sealed with a bonded seal material to physically prevent the sensitizing irritants from contacting the tooth. Sometimes as a complement to this treatment a dentist might give you a tube of prescription fluoride tooth paste to use. Fluoride seals the enamel and prevents sensitivity,