Sensitive Teeth

Tooth sensitivity is caused by the movement of fluid within tiny tubes located in the dentin, which results in nerve irritation. When the hard enamel is worn down or gums have receded, causing the tiny tube surfaces to be exposed, pain can be caused by eating or drinking foods or hot or cold beverages, touching your teeth, or exposing them to cold air.

Exposed areas of the tooth can cause pain and even affect or change your eating, drinking, and breathing habits. Taking a spoonful of ice cream, for example, can be a painful experience for people with sensitive teeth. The excessive consumption of acid-containing foods and beverages, such as citrus juices and fruits and soft drinks, can also put you at risk for tooth sensitivity. Bulimia and acid reflux can also result in erosion of the hard enamel and sensitivity due to acid in the mouth.

Do some products help decrease sensitivity?

Toothpaste for sensitive teeth usually contains a desensitizing agent that protects the exposed dentin by blocking the tubes in the teeth that are connected to nerves. In most cases, these products must be used on a regular basis for at least a month before any therapeutic benefits may be noticed.

How can I avoid sensitivity?

Some toothpastes contain abrasive ingredients that may be too harsh for people who have sensitive teeth. Ingredients found in some whitening toothpastes that lighten and/or remove certain stains from enamel and sodium pyrophosphate, the key ingredient in tartar-control toothpaste, may increase tooth sensitivity.

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Source: http://www.knowyourteeth.com/infobites/abc/article/?abc=S&iid=329&aid=1319