peanut butter, or mayonaise, something kinda oily and a lot of patience. Just put the oily substance on the hair wait a few minutes then carefully comb it out. I swear it works when I was a kid my friends mom used it on my hair and I had gum all through my hair lol. I've used it once on my daughter and it took the gum out but it took a long time to do it.
Glad it worked. Gum is definantly banned in our house. Even my 11 yo can only have it outside when no little ones are around!