There is also a ridge on the back of the first four teeth - two front
teeth and the ones on either side (upper and lower) of some descendants. If you place your fingernail at the gum line and gently draw (up or down) you can feel it and it makes a slight clicking sound. The back of the teeth also curve outward rather than straight as the descendants of anglo-saxon parentage do. Teeth like these are called Asian Shovel Teeth.
Many Indian descendants also have this type of teeth. The back of the first four teeth of Northern European descendants are straight and flat.
An example of northern European teeth would be similar to this diagram: [\l ]
Shovel teeth look like this diagram. Back of teeth [ )/ ] front of teeth,
straight