There are other features that go with the teeth ~ best known modern populations with this tooth type are the Japanese (40% have them), with the Samurai class within that population having a higher percentage ~ which is consistent with the theory that "tamed Emeshi" warriors evolved under Imperial rule to become a permanent warrior class.
Not sure what kind of teeth the Japanese royal family has, but they could have the same kind as Buddha's Sakha tribe had. Seems they were driven out of India only to relocate to North China/Southern Siberia where they mixed with the people known today as the Yakut. The Japanese royal family arises out of the group of Yakuts who ended up conquering Korea circa 500 AD, and then Japan about 560 AD.
The Sakha/Saka spoke Tocharian which is an Indo-European language with roots that seem close to ancient Celtic languages.
The biggest benefit to the Japanese royal family (actually, a whole class of families with claims to the original royal line) is that the women are buxom ~ you can find the same phenomenon among residual noble class families in Korea (most of whom seem to live in the United States anymore).
On The Presence Of Non-Chinese At Anyang
Blondie