Any medicine is to be used for a desired period as long as it symptoms are not relieved.
Same applies to toothpaste as well.
Stop using once ur sensitivity issues are resolved.
Next Steps
Visit a nearby dentist to get it checked if ur problem still persist as u might be having a tooth decay in its initial stages or tooth erosion or abrasions which might require further treatment.
Health Tips
Visit a dentist if ur sensitivity issue is not resolved in a week.