Crowding of the Teeth
Crowding of teeth is where there is insufficient room for the normal complement of adult teeth. Crowding of teeth is recognized as an affliction that stems in part from a modern western lifestyle. We do not know for sure whether it is due to the consistency of western diets; a result of mouthbreathing; or the result of an early loss of deciduous (milk, baby) teeth due to decay. It is also possible that Homo sapiens have evolved smaller jaws without a reduction in the number of teeth they will house happening at the same time. Crowding of the teeth is treated with orthodontics, often with, tooth extraction, dental braces, followed by growth modification in children or jaw surgery (orthognathic surgery) in adults. -Source