Pain to different stimuli

If you experience pain with warm, cold, and/or sugar, avoid foods or beverages that trigger or aggravate the pain. Do not neglect your symptoms! Your tooth must be treated. Make an appointment with your dentist.

Pain after An Endodontic Treatment (Root Canal Treatment)
It may happen that an asymptomatic tooth before treatment can become very painful after a root canal. This could represent a rapid infection beginning. Contact your dentist. He could change your medication or prescribe antibiotics or painkillers.