The rational nutrition is a constituent part of healthy lifestyle. It plays an important role in prevention of the main dental diseases (dental caries, gingivitis, periodontitis and others). The influence of the rational nutrition lies in the teeth formation, resistant to unfavorable factors such as cariogenic action of simple carbohydrates, insufficient amount of necessary microelements and vitamins, etc. At present, there is no major opinion among scientists as to the influence of nutrition on the diseases of teeth and periodontum. Thus, some clinical physicians stick to the theory of dental diseases (periodontitis, in particular), that assigns a role to malnutrition and imbalances, though the previous studies failed to prove this point of view.