Hi, My daughter discovered her fingers when she was an infant. She would suck the index and middle fingers. We didn't try very hard to discourage it - she would do it when she was upset, or tired - it clearly soothed her. As she got older, she would only do it at home when she went to sleep, so we weren't concerned that she would be teased by her peers. We had to take action when she was 7 or 8 -- she had lost her two top teeth, but the adult teeth weren't erupting. Her finger sucking at night had prevented her teeth from coming down. My daughter did have some issues with her teeth, I'm not sure how many problems were caused by the finger sucking. But she did need to have a habit corrector placed in - which was a metal piece that blocked her fingers from going in her mouth. She also needed braces and a palette (sp?) spreader. However, I am not sure if the last two items were necessary because of the finger sucking... the habit corrector did work, however it was a little difficult, and very sad. The orthodontist suggested we keep it in for 6+ months so the habit was kicked. And, it did work. She had braces and the palette spreader for a little over a year. She's 13 now, and her teeth are gorgeous! Honestly, I don't know if we would have done anything differently -- such as discouraging her from sucking her fingers at an earlier age.