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Answer:

Saliva provides an effective barrier against drying and helps limit the penetration of physical irritants, toxins and carcinogens in foods, beverages and tobacco. Saliva contains buffering systems that help neutralize acidic foods and drinks to protect teeth and soft oral tissues from acid attacks.

Explanation:

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Physiological barriers like body temperature, pH of the body fluid, and various body secretions (saliva, tears) prevent the growth of many disease causing micro-organisms. ... Thus, it comprises all those defence elements with which an individual is born and , which are always available to protect a living body.

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