The bad idea behind our failed health-care system.

by Malcolm Gladwell
The New Yorker - Issue of 2005_08_29

Tooth decay begins, typically, when debris becomes trapped between the teeth and along the ridges and in the grooves of the molars. The food rots. It becomes colonized with bacteria. The bacteria feeds off sugars in the mouth and forms an acid that begins to eat away at the enamel of the teeth. Slowly, the bacteria works its way through to the dentin, the inner structure, and from there the cavity begins to blossom three-dimensionally, spreading inward and sideways. When the decay reaches the pulp tissue, the blood vessels, and the nerves that serve the tooth, the pain starts—an insistent throbbing. The tooth turns brown. It begins to lose its hard structure, to the point where a dentist can reach into a cavity with a hand instrument and scoop out the decay. At the base of the tooth, the bacteria mineralizes into tartar, which begins to irritate the gums. They become puffy and bright red and start to recede, leaving more and more of the tooth’s root exposed. When the infection works its way down to the bone, the structure holding the tooth in begins to collapse altogether.