Old Tooth was a very ancient narwal who was friends with Abban and helped Gwynneth save his life. Throughout Star Wolf, Old Tooth appears and helps Faolan and his friends travel to the Distant Blue. He also saves them when they are drowning.
Old Tooth, like all narwals whales, about fifteen feet average length, with a massive tusk or tooth jutting out of his upper lip. He is, however, quite old, and has many faded scars from skirmishes throughout his long life.