Hey there, thank you for the kind words! The teeth were done wit ha base coat of MSP Graveyard Bone, then a light wash of GW Seraphim Sepia about halfway down, pushing the paint the same direction, down into the gums. Then the same thing is done with agrax earthshade, but a quarter way down instead, pushing the paint the same way. Then the line were done with Vallejo Sepia Ink, since it's much stronger. These are known as striations, and I just randomly placed them around the teeth area. I went back in wit ha thinner brush and then intensified the Sepia line, again pushing down towards the gum. I then used the sepia ink around the base of the gum/tooth area. Then I glazed with the Graveyard bone towards the tip to bring everything together. Finally I glazed with ivory to the very tips.
I followed along to this video:
Hobby Cheating 41 - How to Paint Bone Horns (youtube search that)