A dental aligner includes a framework which is made of a rigid synthetic material and supports a shell made of thermoformable material. The framework includes an anterior wall, which is referred to as the labial wall, and a posterior wall, which is referred to as the lingual wall. The walls are substantially parallel to each other and are connected by a bottom wall, which is referred to as the occlusal wall, the latter being substantially perpendicular to both the labial wall and the lingual wall in such a way that the framework has a U-shaped cross section in any vertical plane. The thermoformable shell is accommodated between the labial, lingual and occlusal walls of the framework essentially and is anchored thereon by way of anchoring means which are formed in the framework and the thermoformable shell.
