A.G.
My oldest daughter, now 12, sucked the two middle fingers of her right hand until she was 4. I tried everything I heard about to break her of it. Her teeth were causing red sores on her fingers, her nails were misshappen and her teeth were being affected. The stuff you paint on nails didn't work - it almost seemed like she liked it! Finally, I got inventive... this might help you. I took two small cloth bandaids, the stretchy fabric ones, and dropped regular white vinegar onto the absorbent pads in the middle. Then I wrapped both fingers with the bandaids so that the nasty-tasting pads landed on her tongue whenever those fingers went in her mouth. We'd had a big talk about how she was not to take those off, and it worked like a charm. Within two weeks of using this technique, which is especially helpful at night, she'd stopped sucking her fingers. I hope this helps!