Words starting with D, B, and some times Ts. I also have a lisp and can't pronounce some words correctly, I can say sure perfectly fine, but it's the words with the long S, like science or stutter. The back of my tongue can't seem to just stay in my mouth. I have gone to speech therapy in the past but could never get the hang of it. Thinking about looking into surgery to see if I could get rid of this kind of stutter and lisp. Or guys go back into therapy.