[Freckles and dysplasias of the eyebrows as indicators for genetic abnormalities of the development of the teeth and the jaws].

For the first time the frequency of freckles and of dysplasias of the eyebrows was examinated in 756 pupils. The percentage of the freckles was 21, and of the dysplasias of the eyebrows 28.5 in both sexes. The following examination of 287 orthodontic patients (66 males with hypodontia, 60 males with normal number of the teeth; 92 females with hypodontia, 69 females with normal number of the teeth) has demonstrated the high significance of incidence of freckles and of dysplasias of the eyebrows in patient with hypodontia. This phenomenon is important, because extraoral stigmatas can indicate to disturbances of the development of teeth and also to anomalies of the number of the teeth.