I put my tooth through my lip when I was ten years old. I won't lie it looked horrible. After the first day it didn't hurt much. The doctor said as long as the bleeding stoped and we kept it clean it should be fine - and it was. It healed suprisingly fast. Advice- avoid spicy foods - no citrus, or salts (oUCH) Keep it clean and if it swells worse or turns red around the area moving away from the cut make sure you call the DR. Cold will keep the swelling down - I thought it was a great way to get slurpees and frostys. As far as the thumb sucking, if it hurts he won't do it. I hope this helps a little.