Periodontal disease, the bacteria-related deterioration of the gum and bone tissue that holds the tooth's root in place, is an almost universal ailment. At least 85% of all people over 40 suffer from it to some extent, and it is the chief reason why adults lose teeth. Dentists routinely treat serious cases with "resective therapy"removing diseased tissues and sometimes putting in dentures. An occasional alternative involves root-canal work. Now three Denver dentists are offering some patients a third choice. In experimental operations, they have been tapping their patients' hips for marrow to save their teeth.
Dentists have long attempted to correct some...
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