We make every effort to preserve a natural tooth. But infected roots cause pain and if the infection goes untreated, then the pain and swelling can only get worse. It can even spread to other teeth. So come in before it is too late! Not all dental problems cause pain, but when they get to that state, the treatment is more invasive and complex. While “root canal” has a negative reputation, it may be the best way to keep your tooth intact when the root becomes diseased or damaged.