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Massimiliano · Answer 1 · 2023-10-20T01:17:11+0000

Saliva is the first line defense against disease-causing microorganisms entering the mouth. The primary source of this protection is a protein-based antibody called Immunoglobulin A

Ritu · Answer 2 · 2023-10-24T04:54:29+0000

Answer:

Saliva is the first line defense against disease-causing microorganisms entering the mouth. The primary source of this protection is a protein-based antibody called Immunoglobulin A (IgA), which directly fights infection-causing organisms.

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