“…Muyakens (1937), speech disorders are generally classified in two major groups: disorders linked to neurological diseases and disorders caused by masticatory apparatus dysfunction and its rehabilitation. The functional relations between the tongue and the palate, on one hand, and the tongue and dental rows, on the other hand, are affected by certain dentofacial deformities in dental rows, and by the presence of various prostheses and orthodontic structures (17,18,19,20,21). There is a significant correlation between teeth position and proper sound-production.…”