The famous book “Nutrition and Physical Degeneration” by dentist Weston Price caused a sensation when it was published in 1938, and to this day remains an eye-opening revelation for the vast majority of people. This work completely refuted the so-called “hygienic theory” of how cavities (tooth decay) arise and showed that oral health and oral diseases depend on nutrition. To prove this, Dr. Price carried out dozens of expeditions around the world and uncovered one pattern: wherever people lived and whatever they ate, they retained immunity to tooth decay if they followed traditional diets; but once they switched to the diet of modern civilization, they lost that immunity and, along with it, acquired the entire spectrum of diseases associated with white people. But most importantly, what Weston Price revealed was the possibility of reversing these processes by restoring полноценное (wholesome, complete) nutrition—something he demonstrated through his medical practice.