Tiny Hell Creek Theropod Tooth

[Fossil'n'Roll]

I just found this little tooth for sale. It is from the Hell Creek Formation in Montana and is 5/16" long. Assuming that includes the fake root, by measuring on my screen it appears to actually be 3/16" long along the distal edge. Serrations then are about 9 per 1/16" distal and 13.5 per 1/16" mesial and look more rod-like than chisel-like to me. There are no ridges on the sides, so it's not Acheroraptor. Could it be Dakotaraptor? This species has been #1 on my list for a while and I would love to have this in my collection if it is Dakotaraptor.

[Troodon]

It could be DR but without a clean base cannot be certain.  It has some of the characteristics of one.

[Fossil'n'Roll]

Thanks, not sure if I want a maybe. I'll have to think about it. Here is another view. What's needed for a sure ID is distance from the base of the mesial carina to the gumline, right? Sadly that appears to be either not preserved or covered up.

[Troodon]

 I hate to say it is without a good look of the shape of the base and a full mesial carina.  

[Fossil'n'Roll]

I will pass on this one and will keep looking for a better one. In the meantime, I'll keep learning. I just read (and bookmarked) this post. Excellent info. Thanks again!