USA - Chart: If you don’t go to the dentist, your teeth will literally fall out of your head

"Still, plenty of people lose their teeth even with fluoride. In 2002, the Department of Health and Human Services estimated that nearly a quarter of Americans in their 40s had fewer than 21 teeth (for reference a full set of teeth, with wisdom teeth removed, is 28). Water fluoridation is a necessary, but not sufficient, condition for maintaining optimal oral health. Good brushing, flossing, and dental care are also required."

Despite fluoride in the water, food , their toothpaste and mouthwash they still lose their teeth.