Salivary pH remains low between meals which makes frequent snacking inadvisable. Maximizing the interval between food intake allows time for teeth to remineralize after exposure to acids.
Heyman MB, Abrams SA, Fruit Juice in Infants, Children, and Adolescents: Current Recommendations. AAP SECTION ON GASTROENTEROLOGY, HEPATOLOGY, AND NUTRITION, COMMITTEE ON NUTRITION. Pediatrics. 2017: 139(6).