What is the primary composition of saliva?

Saliva is primarily composed of water, and the correct option indicates that it consists of 97-99.5% water. This high water content is essential for its various functions, including facilitating the process of digestion, helping to dissolve food particles for taste perception, and providing a moist environment to aid in swallowing. Additionally, the water in saliva helps to maintain oral hygiene by flushing away food debris and aiding in the antimicrobial action of saliva, which contains various enzymes and proteins. The remaining constituents of saliva, including enzymes, electrolytes, and mucus, make up a very small percentage compared to the water content. This composition is critical for maintaining oral health and aiding digestive processes.