Tongue size: House classification
Class I: Tongue have normal size, development and function. There are sufficient teeth present to maintain the normal form of the tongue.
Class II: Teeth had been absent for a very long time period and caused change in the form and function of the tongue.
Class III: Excessively large tongue.
Wright’s classification of tongue positions
Class I: Tongue lies in the floor of the mouth with tip forward and slightly below the incisal edges of the mandibular anterior teeth. This is the Ideal position of the tongue.
Class II: The tongue is flattened and broadened but the tip is in a normal position i.e. slightly upward and slightly below the incisal edges of the mandibular anterior teeth.
Class III: The tongue is retracted and depressed into the floor of the mouth, with the tip curled upward or assimilated into the body of the tongue.