A root canal in your tooth can become infected due to a cavity or fracture that allows in bacteria. When a root canal becomes infected it can die. At this point you will begin to feel pain and pressure in and around the infected tooth. According to Dr. Abraham Katz of Herndon, VA this is your first sign that you will need one of the most common procedures in general dentistry, root canal therapy. Without treatment the infection spreads and could lead to tooth loss.
What is root canal therapy?

Do you have bad breathe, sensitive teeth and bleeding gums? You may have gum disease. There are two forms of gum disease: gingivitis, an inflammation of your gums caused by plaque, and periodontitis, a more advanced version of gingivitis that results in a gap between your teeth and your gums.
Sleep apnea is a common sleep disorder that causes pauses in breathing while sleeping. These pauses can last between 10 and 20 seconds and can happen up to 30 times an hour. This means you will spend more time in a light disturbed sleep, depriving you of the restorative sleep you need for the next day.