Best Root Canal Treatment in Kodambakkam Chennai 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. Ksmile Dental Care gives best root canal treatment in chennai.