DEAR DOCTORS: Our nine-year-old loves science and has become obsessed with saliva. He recently learned in school that it helps prevent disease, and now he wants to know more. My wife and I are glad he’s curious and hope you can help. What is saliva? Does it really help people stay healthy?
DEAR READER:Your budding scientist has asked a great question. When you think about the many ways our bodies protect us from potential danger, saliva isn’t the first thing that generally comes to mind. And yet, it’s a crucial line of defence. It makes sense, considering the mouth is a key…
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