Gene for enamel could prevent decay

ROTTEN teeth and unpleasant visits to the dentist may be less frequent, now that a gene needed to make tooth enamel has been identified. Humans cannot restore damaged enamel because cells that produce it, called ameloblasts, retire once teeth have been coated in enamel. If the coating is damaged, cavities can form. James O’Sullivan at the University of Manchester, UK, and colleagues, scanned the genomes of four family members who had amelogenesis imperfecta (AI), a condition that leads to weak enamel,
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