Ball essential oil is easy to pollute. According to relevant information, the small ball is located at the bottle mouth of essential oil, which is in direct contact with the external environment and is easy to be polluted, which affects the internal essential oil and needs to be cleaned in time. The application method of ball essential oil is to turn the essential oil upside down, and the essential oil will stay, wet the ball and roll on the skin. The ball is in direct contact with the skin. When using the ball, the ball will bring dust and bacteria from the face into the essential oil of the ball. If the ball essential oil is used for a long time, impurities will be found in it, which will accelerate the deterioration of the essential oil.