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This is really interesting to me because D helps in Calcium and Phosphate (building blocks of enamel) absorption, and K2 helps in using them to build bone. If they really were the only culprit in ridding you of your sensitivity than that means your body regenerated Enamel on its own. n=1 aside your comment gives me renewed faith in the human body.

What brand of K2 and Vitamin D did you use?

Bulk Supplements, but mostly because they're the cheapest per gram I can find. I don't think you need anything fancy per se.

Be careful with very high doses of vitamin D supplements if you have a family history of heart disease - over the long term it can increase calcium buildup elsewhere as well, which can damage the heart (amongst other things).

I found the same thing, taking K2 (the Carlson labs MK-4 version) with some D3 drops helped hugely.