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Saliva is a complex mixture that contains not only various proteins, but also DNA, RNA, fatty acids, and various microorganisms. When the baby is sucking the pacifier, the baby’s physiological condition is detected by the pacifier. The pacifier will present different colors by sensing the result. In other words, by the pacifier we can learn about the baby's health to prevent the disease, in addition to knowing if the baby is hungry or thirsty, so as to ensure the baby's health.