Those who have studied the nutritional conditions of primitive Africans in tropical Africa are unanimous in stating that they show no clinical signs of dietary deficiency. One of the most striking indications of the superiority of indigenous African diet is the magnificent condition of the teeth. One researcher among six ethnic groups in Kenya could not find a single case of tooth decay, not a single deformation of dental arch. But when those same people were transplanted and put on the civilized diet available under colonialism, their teeth began to decay at once.

p. 373. - How Europe Underdeveloped Africa (1972)