Teeth Gap and Race

[Kant111]

is a gap between the incisors significant for classification?

[Frans_Jozef]

is a gap between the incisors significant for classification?

You probably mean retromolar gap:

retromolar space: A space or gap at the rear of a mandible between the back of the last molar and the anterior edge of the ascending ramus where it crosses the alveolar margin.

http://www.archaeologyinfo.com/glossaryr.htm

http://www.pbs.org/wgbh/nova/neanderthals/skul_vrs.html

It existed in Neanderthals, but some sources mention that the Predmost3 specimen, a Central European Cromagnoid exhibited the same feature.
Since I belief that these CE Cromagnoids are ancestral to the Tydal and Paleo-Atlantid races, it would be interesting to research of there are still limited but indicative survivals of retromolar gaps in PA's.

[Kant111]

thank you,but i meant a gap in the front teeth.

[Euclides]

He was talking about this: