Root canals are needed for a cracked tooth from injury or genetics, a deep cavity, or issues from a previous filling. Patients generally need a root canal when they notice their teeth are sensitive, particularly to hot and cold sensations. There are a few symptoms that mean you might need a root canal-

• .  Severe pain while chewing or biting
• .  Pimples on the gums
• .  A chipped or cracked tooth
• .  Lingering sensitivity to hot or cold, even after the sensation has been removed
• .  Swollen or tender gums
• .  Deep decay or darkening of the gums