Cosmetic dentistry may involve:

The addition of a dental material to teeth or gums – examples: bonding, porcelain veneers (laminates), crowns (caps), gum grafts.

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The removal of tooth structure or gums – examples: enameloplasty, gingivectomy.

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Neither adding nor removing dental materials, tooth structure or gums – examples: teeth whitening (bleaching).

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Straightening of teeth accompanied by improvement in facial appearance -  Orthodontics.