In Europe, most coffee shops bring a cup of expresso coffee with them, and a glass of water is mandatory. It has recently been scientifically proven that this traditional service is the most correct and the only way coffee should be consumed. Coffee contains theobromine in addition to caffeine, which provides an immediate revitalizing effect. Although these two substances enter the body at the same time, they act at different times, caffeine acts immediately, while theobromine acts only after 25 minutes. Caffeine dilates the blood vessels of the kidneys and constricts all other blood vessels in the body, causing the blood pressure to rise, and the fact that a person falls asleep after 30 minutes is related to the increase in body pressure and the decrease in kidney pressure. The action of this theobromine is neutralized by drinking water immediately after drinking coffee. Therefore, submerging the coffee with water prevents pressure build-up and protects the teeth from the dyes that affect the tooth enamel.