The Dragon's Tooth is a Relic found in Lara Croft: Relic Run. It is the twelfth relic that can be found in the Jungle Temple after collecting 18 clues in the 24 level. (Originally 30 clues in endless mode before version 1.5.68.)
The carvings I've seen are unusual for this area. Carter stumbled into something long hidden, and it wants to keep it that way!