Why our mouth does not get oily after eating oily food?

Our mouths do not become oily after eating oily food primarily because saliva helps emulsify and break down fats, preventing them from coating the mouth. Additionally, the mucous membranes in the mouth are designed to keep it moist without retaining excess oil. Any residual oil is usually washed away by saliva and swallowed. This combination of saliva and the structure of our oral cavity helps maintain a clean sensation even after consuming oily foods.