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In page Dental braces:

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According to the Orthodontic Practice Study by the Journal of Clinical Orthodontics based on 10,956 orthodontists, average costs range from $5000 to $6000.[1]Most health plans don't pay for orthodontic treatment for people over 18 years old, hence they do partially cover children under age 18. The amount of coverage varies, a common figure is 50% coverage with a $1500 lifetime maximum per child.[2]