Galvayne's groove

Galvayne's groove

a vertical goove in the labial surface of the upper corner incisor tooth in the horse. It appears at the gum margin at 10 years of age, is halfway to the end of the tooth at 15 years, has reached the end at 20 years, has disappeared from the top of the tooth at 25 years and has disappeared completely at 30 years. The ages quoted are subject to variation.