From 800 patients with dysgnathias and from 90 probands with eugnathic bite those persons were selected, who had no sigmatism. The position of the tongue during the articulation of the sound S was proved at persons without sigmatism. Sigmatism is observed as highly significant more frequently at patients with dysgnathias than at probands with eugnathic bite. An apical kind of formation of the sound S is observed as significant more frequently at patients with dysgnathias than at persons without dysgnathias. Apical S is found as highly significant more frequently at the "open bite" than at the "lack of room" and at the "extended overjet". Apical S especially together with dysgnathias may be valued as a transition to a pathologic sound S.