A root canal may be necessary when a tooth has a very large cavity, trauma, cracks, or has been broken down badly. Most of the time, the tooth will be pretty sore, which means it is sensitive to colds, hots, or pressure. Sometimes, if the infection lasts for a long time, you may notice a small pimple on your gums, or the tooth can start to change colour. A root canal is done to clean out the infection and save your tooth. If you are experiencing toothache symptoms, call our office for an emergency appointment so we can make you feel comfortable again.