Tooth Ache

Either decay in a tooth or leakage from around a restoration causes the dental pulp (nerve) to become inflamed. Such a tooth can be painful, especially to temperature changes, pressure from biting, touching the tooth, or sometimes the pain is spontaneous.

If the episodes of pain has been present for days, or is severe or/and continuous, then probably the tooth is suffering from an irreversible pulpitis.

Either root canal treatment or extraction is recommended for these teeth. 

tooth ache