The root of a tooth includes the lower two-thirds of your teeth that is buried under your jawbone. When gum disease develops, all the different the bacteria that cause the disease can also dissolve bone around the tooth root. Dissolved bone and receding gums demand more tooth is exposed. Without protection from healthy gums and bone, the root becomes sensitive to hot and cold.
If root exposure is not severe pain in the tooth, you can use special toothpaste to help with sensitivity in teeth. The best way to manage root sensitivity is to prevent gum disease by creating a good oral health routine with brushing and flossing. Be sure to use soft bristle toothbrush to avoid gum irritation and recession.