<正>The different types of tea depend upon the region in which it is grown,harvesting time and the procedure of processing.Basically,there are four major classes of tea:white,oolong,green and black tea.The white tea has very low content of caffeine and appears a light color,as the name also indicates and a mild flavor.Due to the presence of high amount of healthy chemicals,it is helpful in fighting skin-related health problems and in getting a fair color of skin.Another tea type is the oolong tea,also called as wu long tea at some places which has very rich flavor and has a sweet taste.The caffeine(咖啡因)content in it