Question: In "X-Men Origins Wolverine", Logan undergoes an operation to have Adamantium bonded to his skeleton. 

Why doesn't the Adamantium bond to his teeth?

Answer: 
Interesting point - since Wolverine is a fictional character, it could simply be because adamantium teeth are not good looking.

However according to [this article](http://sciencenordic.com/why-don%E2%80%99t-teeth-heal-themselves) It seems to be related that teeth do not have any cells to repair themselves, plus they are exposed to what we breath in and eat.

Maybe the bones that where bonded where only the ones that could repair themselves. Wolverine could heal himself quickly if not instantly, so it would stand to reason that the bones inside the body would be able to cope with the transformation, and the teeth couldn't.

Then again, it is only a theoretical answer for a fictional character.
I think the most simpliest answer is that the adamantium was **injected into his body**, where it covered his bones. In order for his teeth to be covered the injected metal would have had to ooze out of his gums into his mouth.