Removable dental appliance with interproximal reinforcement

A removable dental appliance comprising:

• an appliance body configured to at least partially surround a plurality of teeth of a dental arch of a patient, wherein the appliance body comprises:
• a first shell shaped to engage a first tooth of the plurality of teeth in an initial position of the first tooth;
• and
• a second shell shaped to engage a second tooth of the plurality of teeth in an initial position of the second tooth, wherein the second tooth is adjacent to the first tooth;
• and
• an interproximal reinforcement comprising an integral rib on an exterior of the appliance body extending from a first gingival edge of the appliance body on a labial side of the appliance body along an interproximal region between the first tooth and the second tooth to a second gingival edge of the appliance body on a lingual side of the appliance body,
• wherein the interproximal reinforcement is configured to engage at least one of a lingual surface of the first tooth below a height of contour of the first tooth or a labial surface of the first tooth below the height of contour to enable the appliance body to apply a force vector at a contact point on the first tooth to cause movement of the first tooth toward a desired position of the first tooth when the removable dental appliance is worn by the patient, and
• wherein the interproximal reinforcement comprises a length that extends beyond an edge of the first and second shells at the interproximal region, the interproximal reinforcement being configured to protrude over at least a portion of a gingival margin of at least one of the first tooth or the second tooth.