Incoming tooth/popcorn husk stuck in gum and tooth.?

This morning my son noticed he had a what looked to be a corn husk stuck between his tooth and gum. When i got a flashlight it did not really look that much like a popcorn husk. The reason I suspected it was a popcorn husk was because we had movie night last night. He also has a bit of his adult tooth coming in. The tooth the "popcorn husk" is stuck by is the wisdom tooth i think, it is the tooth right before the molar. The popcorn husk is on the outside so I was thinking it could be part of the incoming adult tooth? I'm not sure and well answers are appreciated.