Orthodontists use nitinol for the wires in braces. At room temperature, the wire is very flexible. Inside a human mouth, where it is about 37°C (98.6°F), the superelastic nitinol alloy metal warms up and begins to exert force on the teeth. These orthodontic archwires move teeth with a low, constant force. The increased elastic range reduces the need for wire retightening, thus accelerating the dental correction process. The mild, continuous pressure decreases treatment time and increases patient comfort.