The tooth right next to my top front tooth is sensitive. Heat and cold triggers a sharp pain in my gum. If I tap the tooth it hurts, but if I hold the tooth still and tap it, it no longer hurts and isnt as sensitive. The tooth has had a filling before which does not seem to have weakened. What could this be?
Sensitivity can be triggered if there is dentin exposure, in your case possible recurrent decay in your existing filling. Sensitivity could be also due to gum recession. Whatever the cause may be, condition can be treated. Kindly get an x-ray done. You start using desensitizing paste for transient relief.