Which of the following type of tongue thrusting has the worst prognosis?
(A) Simple (B) Complex (C) Retained infantile swallow (D) All of the above
(C) Tongue thrusting has been variously described as a deviate swallow, visceral swallow, retained infantile swallow or reverse swallow.
Prognosis

Simple tongue thrusting - Excellent
Complex tongue thrusting - Good
Retained infantile swallow - Poor

Pediatric Dentistry, Principles and Practice / M.S. Muthu, N. Sivakumar - 2nd Ed