动物们从来不刷牙，为什么没有蛀牙？

Group 1 - The article discusses the historical struggle of humans against dental caries, known as "cavities," which have been present since ancient times, with evidence found in fossils dating back 500,000 years [4][5][11] - The prevalence of cavities has significantly increased in modern times, with a reported rate of 70.9% among 5-year-old children in a 2017 survey [5][10] - Ancient medical texts provided various methods for dealing with cavities, indicating that the understanding and treatment of dental issues have evolved over time [7][8][10] Group 2 - The article highlights that certain animals, such as fish and rodents, can continuously replace their teeth, making the issue of cavities less relevant for them [12][16][18] - Herbivores, like cows and sheep, have natural mechanisms to maintain dental health through their high-fiber diets, which help clean their teeth [24][26] - The relationship between sugar consumption and the incidence of cavities is emphasized, with historical data linking the rise of sugar production to increased cavity rates in humans [27][29][30]