Well he wasn't. Matthew gashed his mouth open while running down the hall. We aren't actually sure what happened as John was the only witness to the event.
After 3 hours at the ER, it was determined that Matthew would need to be seen by an oral surgeon the next day. He had "gloved" himself. This means, removing the skin from the top of your teeth up to your jawline. He had exposed bone showing and therefore we had to start him on antibiotics.
After a visit to the oral surgeon the next day, it was determined that we would take a wait and see approach on his mouth. He had actually fractured his top left front tooth and the one next to it was extremely loose.
Here are some pictures of Matthew...