Which of the following type of tongue thrusting has the worst prognosis?
Simple
Complex
Retained infantile swallow
All of the above
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