My step-son was hit in the mouth during a baseball game. He had two teeth( the front tooth and the one next to it) displaced. He was taken to the ER they were placed back into position. Exrays are normal. He saw a dentist the next day. After that besides being incredibly sore, his gum above the area turned white. Then a day or so later the white area was not there. He had not been brushing his teeth do to the pain. And shortly after he began brushing it went away. Is there anything to worry about, is that normal, why did it happen?