No, tea oil can protect hair and is especially useful for frizzy hair, but as far as I know it will not make white hair black. Eating more black sesame seeds may be more effective.
Tea oil is very useful for red buttocks and eczema. In addition, it can kill insects, so it is very good to eat. My mother said that someone in her hometown once had worms in her stomach and they were punched out. The skin care and moisturizing effect is also very obvious. In addition, tea oil can be used even if there is a bruise or injury. Camellia oil has many functions and many folk uses. If you are interested, you can search for Hunan Hubei Bao, which provides camellia oil.