usually caused by the misalignment of the tongue muscle in the mouth which leads to the incorrect production of specific sound or sound groups during normal and free speech. There are four different forms of a lisps, interdental lisps, dental lisps, lateral lisps and palatal lisps. These different types of lisp are the result of different tongue placements.
LISP 1: “Lisps can occur due to a number of reasons, the physical slurring of speech however is due to a misalignment of the tongue muscle in the mouth.”