Orthodontic teeth will lead to gum recession, for the following reasons: 1, fixed orthodontic process, the tooth labial adhesive brackets, buccal tubes and ligature wire end easily retained food residue and soft scale, if not cleaned in time, will mineralize the formation of calculus, stimulate the gums red, swollen, bleeding, resulting in gum recession; 2, excessive orthodontic force will destroy the growth of alveolar bone alteration, prompting the root resorption, resulting in gum recession after the formation of black 3, as the supporting teeth of the molar, if the cervical edge of the adhesive band ring is too long or does not remove the excess adhesive, will stimulate the gums to cause recession; 4, the invisible aligners too long edge will press the gums to cause recession.