I can't say for sure for the mammoth tooth but I have used it with antler and bone, but you have to thin it. I can't remember for sure but, I think I thinned with either Acetone or it may have been Denatured Alcohol, you will need to experiment unless you want to buy the real thing! I can't remember but Boss, may sell it. Bruce Bump uses it maybe he can tell you.
However any way you go you are going to have to go back and sand off the excess, IMO but that leaves the crack filed and you finish it by buffing! With antler I used a greenie pad to buff of the excess, it gets into the grain of the antler without taking it back out of the cracks. It also keeps the antler from doing a major change with light spots on the high areas of the antler. You can't dilly dally even with the thinner/reducer in the CA! It doesn't come with out some work any way you go about it!
This was a piece of sun bleached antler complete with crack and a few knaw marks for critters. It was done in stages. The CA was put in to seal and strengthen. Then buffed with a greenie pad, then a coat of thinned black rustolem paint and the buffed with a greenie pad again. The it was hit with a coat of Potassium Permanganate to give it a brown color and then rebuffied, and another coat of CA. Before it was finished it was lighlly buffed to achive the tones and sealed with CA a final time. It kind of like doing a painting you do the back ground first and then build out from there!
The only way that is easier is too send it of to have it stabalized and tinted/colored and then you exchange of a boat load of money he sends it back and you use it, or drop it, ................... well you know how it goes from there!:3::lol: