Nicole Smith-Guzmán holds up a small lower jawbone and says it belonged to a seven-year old child who grew up on a sugary, corn-based diet. Although the child died over 1,500 years ago, she can determine its age to within six months based on the number and size of milk versus permanent teeth. She points out several signs of dental disease—a tooth cavity, an abscess in the jawbone, a gap from a fallen milk tooth with the bone healed over before the permanent tooth could grow out. On another person’s jaw, impacted teeth suggest that the jawbone never grew to its full potential because it only chewed on soft, mushy food. On yet another set of teeth, she points out ancient tartar, which may hold plant remains and even traces of mouth bacteria.
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