My sister had a dummy till she was almost 5, never had any problems. I, on the other hand, never had a dummy or sucked my thumb and I still needed braces as a teenager It really depends on the child. I've always thought that a lot of what they say about dummies is exaggerated by some so they can feel superior about not using them.I had my dummy until I went to nursery, I was very attached to it but I was a very chatty kid, and I have no speech issues as an adult. I guess it depends on the child. I think my dummy was soothing, I must have taken it out when I wanted to talk