If a tooth has a deep cavity or has been traumatized, it may cause the inner pulp of the tooth (which contains the nerves and blood vessels) to become inflamed or infected. Left untreated, this will eventually lead to  swelling or a nasty abscess at the tooth’s root tip. This may cause extreme pain or be completely painless! Root canal treatment carefully and thoroughly removes the injured pulp from the tooth and seals off the root. Your tooth will be good as new!