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Sensitive teeth are primarily caused by gum recession. Gums recede for many reasons, like brushing too hard, age, and periodontal disease. When gums recede, small openings in the root of the tooth called dentine tubules are exposed and may be opened by acidic foods and drinks. These open tubules lead directly to the nerve of the tooth and can cause pain. Dentaltown Message Board > Hygiene > Toothpaste > Sensodyne http://www.dentaltown.com/MessageBoard/thread.aspx?s=2&f=258&t=222616&pg=1&r=376425
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