Kindly consult a dentist in person for further suggestion. We need more investigations to decide upon treatment. You may need deep cleaning along with desensitizing procedures or artificial enamel filling. You may consult me in person too. Gargle your mouth thoroughly after every meal. Scrub gently to clean your tongue. Floss all your teeth inter dentally & brush twice daily, morning & night, up & down short vertical strokes, with ultra-soft bristles, indicator brush.