Saliva is a biological fluid which is clinically informative, for clinical diagnosis and for monitoring management of patients with both oral & systemic diseases. Saliva is considered as mirror of body health.
It is the product of the secretions of the three major salivary glands i.e (parotid, submandibular, sublingual) and the numerous minor salivary glands mixed with other body fluids such as bronchial and nasal secretions, blood constituents from wounds or bleeding gum, bacteria, viruses, fungi, exfoliated epithelial cells and food debris.