[The principles of organizing hygiene education for the population].

The authors recommend the only type of movement of the toothbrush: along the vertical axis of the tooth with the maximal involvement of the gingival mucosa. The duration of the process depends not on its time, but on the number of the cleaning movements made. Twenty paired movements with the toothbrush are sufficient to remove completely the bacterial coating of the incisors, 25 movements to make so for the canines and premolars, and 30 movements for the molars.

[A method for the early diagnosis of caries].

A method is offered to detect early enamel demineralization prior to formation of caries area which can be stained with methylene blue. The technique is based upon the detection, under the caries-eliciting superficial layer as determined after J. L.