The optimal force has to be applied at all times, i.e. the force that produces the fastest movement of the tooth, without creating discomfort for the patient and damaging the tissues.

The idea that the higher the force, the fastest the tooth movement, is totally false.

When the force is excessive, the pressure on the periodontal tissue is excessive. Blood vessels are compressed and the supply of oxygen and cells needed to reshape the bone decreases. The tooth does not move and a severe, long-lasting pain appears. Also, inflammations of the dental pulp may occur, as well as very painful pulpitis or resorption of the root, which shortens.

Any pain that requires the administration of painkillers and lasts more than 2-3 days, without decreasing in intensity, may be pathological and must be investigated by an orthodontist, to see if the force applied onto the tooth is not excessive. Irreversible complications may appear, including the loss of the tooth.