That's a very good question but I don't think they are.

Hm... doubt it. But maybe..?

That would certainly cut appointments to the dentist, though to quote ironshadow that is a good question.

Logically it should be...but writers and artists chose not to...teeth are the only bones that can be easy dislodged..like in the old western movies where the bandits say "...and will take that golden tooth..." Knife flashing, panel darkness, screaming....
Perhaps somebody robbed Wolvie's or he lost them in a fight...XD
At least one version of Sabertooth had Adamantium teeth....

So teeth, claws, and hair are not bones....in the stricter sense...they do not have a marrow in any case...

" That would certainly cut appointments to the dentist, though to quote ironshadow that is a good question. "

" @The WeatherMan said:

" I thought all of his bones were coated in admantium. That would include teeth, wouldn't it? "

By that logic his hair and fingernails would be too. "

" Just asking... Cause I always see them white... not in grey silvery metal colour. "

"
Teeth are not bone.  
 
"Teeth (singular tooth) are small, calcified, whitish structures found in the jaws (or mouths) of many vertebrates that are used to break down food. Some animals, particularly carnivores, also use teeth for hunting or for defensive purposes. The roots of teeth are covered by gums. Teeth are not made of bone, but rather of multiple tissues of varying density and hardness. " "

They are nod covered of adamantium for sure. Although a bit strange, the teeth are normal bone. The process of bonding adamantium to his bones did not make nothing to his teeth. 
By the other hand, the Ultimate Sabretooth has adamatium teeth. I'm sure about that. 
Best regards! 
Vinny!

wolverines skeletal adamantium bone remains after he died in days of the future past has adamantium teeth. I'm sure in almost any issue his bone remains have adamantium.

Would his teeth heal though if damaged?? He has a superhuman healing factor, meaning amplified healing compared to normal humans. Last I checked, people getting teeth knocked out or chipped don't really see them growing back. With getting smacked around, the dude HAS to have gotten a chipped tooth or something. 
 
I bet he has adamantium dentures with white veneer, haha.

I think they are whenever his skeleton is shown, like during Civil War and he was burned down to the skeleton by Nitro, but whenever he is in a normal state they seem to not be admantium. It would look pretty weird if he normally walked around with a shining mouth.

Well, I´ve never seen anyone breaking Logan's teeth in a brawl,
so I´ve got to admitt that Wolverine has adamantium in his teeth too
(since they´re bone)

Calcium is silver and metal like.  Teeth is white because it is mostly hydroxylapatite mineral containing calcium, not calcium itself.  Hydroxylapatite's chemical formula is " Ca 10 (PO ) 6 (OH)2". Adamantium teeth is "Adm10(PO4)6(OH)2".

They may be white on the surface but still be adamantium underneath, like his regenerative abilities keeps up the outer layers even though there's nothing to protect under them.  
Anyone ever seen him get a tooth knocked out of his mouth?

"Adm10(PO4)6(OH)2" could be that the Adamantium metal replaces the Calcium metal in his teeth. Then it would be hydroxyladalite (which is also white) instead of the weaker hydroxylapatite (which is white). It just doesn't look any different visually. Wolverine never had a tooth knocked out of his mouth.

They will be if a writer decides he needs something new.

having adamantium teeth wouldn't really keep them from being knocked out anyway...

Maybe he grows them back like a shark? Kidding, idk I doubt they are.

It's been established that his teeth are not coated in adamantium since teeth are not bones.   But what about those three super-tiny bones in the inner ear (malleus, incus, and stapes). They are bones, so they are part of the skeletal system. But wouldn't it severly distort Wolverine's hearing if the bones in his inner ear are coated in adamantium?