Dual aligner assembly

A method of fabricating a dual aligner assembly, the method comprising:

• fabricating a first aligner,
• wherein the first aligner comprises a first material having a first rigidity,
• wherein the first aligner comprises tooth cavities having a first shape corresponding to a set of target tooth positions,
• wherein the first shape is configured to apply a first orthodontic force against a set of at least three adjacent target teeth when the first aligner is worn by a patient, and
• wherein the first orthodontic force is configured to move the set of at least three adjacent target teeth from a set of current tooth positions towards the set of target tooth positions through a desired treatment movement pathway;
• and
• fabricating a second aligner,
• wherein the second aligner comprises a second material having a second rigidity greater than said first rigidity,
• wherein the second aligner is configured to at least partially enclose the first aligner and envelope said set of at least three adjacent target teeth in said set of current tooth positions, and
• wherein the second aligner is configured to anchor at least a portion of the first aligner, wherein via said anchoring, a combination of the first aligner and said second aligner create one or more controlled forces to move said set of at least three adjacent target teeth toward said set of target tooth positions through said desired treatment movement pathway;
• wherein the first aligner is configured to snap over a plurality of teeth, and the second aligner is configured to snap over the first aligner.