“…In this context, Voss [50] (2007) described that in the examination of the resting position of the tongue according to Kittel, lip retractors could be used to view the entire vestibule of the mouth and, in turn, allow an abnormal tongue resting position to be detected. Attention was also paid to additional conditions, such as tension of the orofacial musculature and insufficient lip closure, which are related to tongue dysfunction ( Figure 1f) [12,14,20,33]. The subjects were told to drink some water before the examination in order to avoid a distorted position of the tongue due to dry mouth.…”