Shovel teeth?

It’s also very common in Asia. So, really, it’s possible indication of either Asian or North American ancestry.

Do understand that not all Native Americans have shovel teeth, nor do all Asians, and the trait occasionally appears in people from other parts of the world. Statistically, it’s most common in Asians/Native Americans but it’s not exclusive to them.

So we should listen to UncleBeer.

This pic shows the shape very well.

Apart from everything else, that’s not how genetics works. Even assuming there is a genetically determined shovel tooth trait, and assuming it’s dominant, it would quickly get diluted once outbreeding starts. In two generations, at most, only half of the descendents would have the trait. It would be reduced by roughly half each further generation (assuming no fresh infusion of DNA carrying the trait). There’s no possible way to have a specific trait that labels every descendent, no matter how dilute the blood connection gets.