Do you have night grinding habit/acidity
First need to rule out that.
Apply,sensigel ointment on tooth sufaces which have sensitivity, for 5 mins at a time, do not touch with tongue for that time being. And rinse.
Do it for 5-6 times per day until the sensitivity subsides.
Health Tips
don't use teeth in question on biting hard food such as apple, hard peeled guava/guava seeds, ice cube,
sugar cane, hard biscuits.