K.M.
fairly recently my 2 year old did the same thing. hs tooth went all the way through. It was horrifying. bled like crazy !! I took him to the doctor and learned that 1) they do not stitch there 2) there are so many blood vessels there (that's why the lips are so red) that they tend to really bleed and 3) because of all the blood vessels and some other nutrifying bacteria present on the lips it will NOT get infected. My sons turned white, like an open gash would, and swollen and just aweful looking, but it healed pretty quickly too. Also, it didn't seem to bother my little guy too much. Not near as mch as it bothered me to look at it ;-).