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This can be the result of relatively rare genetic disorders, such as amelogenesis imperfecta.

The condition closely resembles a somewhat rare modern genetic disorder called amelogenesis imperfecta that affects about one in 1000 people worldwide, the researchers report this week in the Journal of Human Evolution.

India Coleman, 31, spent most of her life in constant pain, suffering from frequent infections caused by the disorder known as amelogenesis imperfecta.