Dragon Teeth are two daggers that the crafty criminal Kira of the Black Dragon clan wields in both Mortal Kombat: Deception and Mortal Kombat: Armageddon. They were later featured as another collectible Relics under the name Kira's Knifes within the Konquest mode of Mortal Kombat: Armageddon as well.
Kira as she did in her early days, uses this particular weapon to sneak up on her enemies and promptly slit their throat to avoid detection. Still, many of Kira's enemies have met their untimely fate to this knife.
Interestingly, the knives look different in the Konquest mode of Mortal Kombat: Armageddon than in-game and in her renders.