If roughly brushing the teeth it may cause different gum problems. Fortunately, irritation does not cause permanent damage to the tooth; proper oral hygiene is the key to preventing retraction of the gums and the pain that a sensitive tooth can cause.
Cavities and fractured teeth can cause greater sensitivity in the teeth, causing discomfort when eating cold or hot food. But if a dentist has ruled out these problems, then the cause could be a worn tooth enamel, a broken tooth or exposed tooth root.
Enamel is the substance that protects the crowns of healthy teeth. A layer called “root cement” protects the root of the tooth below the gumline. Under the enamel and dental cement is the dentin, when it loses its protective cover, the tubules allow hot, cold, acidic or sticky foods to stimulate the nerves and the cells inside the tooth causing occasional hypersensitivity and discomfort.