People who went to a speech therapist, did they really improve?

People who went to a speech therapist, did they really improve? Hello everyone, I wanted to know if it really works, or at least it "cures" you, because tomorrow my first speech therapy session starts and I don't know what to say, or I'm afraid of not improving. If anyone who was or is at a speech therapist, give me some information. It would be greatly appreciated. Thank you