I seem to build up tartar quite easily on the inside of my lower middle four teeth. As far as the usual suspects go... I take 4000 IU/day of vitamin D3 and have a blood level of 55 ng/mL. I supplement vitamin K2 daily using LEF's Super K (1 mg K1, 1 mg K2 as MK-4, 0.1 mg K2 as MK-7) and also consume 3-5 tablespoons of pastured butter per day. I don't take in much calcium, but it seems the US RDA is too high for people who have their other variables in line.
I did realize today that I am probably not taking in enough magnesium, which I understand to be an important factor in bone/tooth health, so I plan to fix that. I have been supplementing 140 mg of magnesium malate per day for quite a while (I believe I started this a few years ago based on some discussion on imminst.org regarding the best magnesium supplements), but as I look at lists of good magnesium sources, it seems my daily avocado is the only significant contributor of magnesium.
Any comments from anyone who has experienced some tartar buildup despite eating paleoishly, or who noticed the appearance/disappearance of tartar with some specific change of variables, would be a big help... thanks!
Edited to add that this is a relatively new problem- I don't think I had it more than two or so years ago. I think it may have been roughly three years ago that I started supplementing with D3 and K2, although I'd probably have to check some records to be sure of that.