It's best to eat less oily hair. In terms of food, try to eat more fruits and vegetables and drink more water than the average person, which will help reduce the secretion of sebaceous glands. If it's not morbid, try a more alkaline shampoo. Pay attention to clean the scalp, oily hair is easy to stick with dirt such as dust, and excessive oil secretion is also easy to block the pores of the head skin and produce itchy dandruff. Don't wash your hair with overheated water to avoid stimulating oil secretion; Hair conditioner can only be applied to the hair shaft, not to the scalp. It is best used in combination with contraction effect, which helps to shrink scalp pores and reduce sebum secretion. For example, you can do it yourself, dilute vinegar with a basin of warm water, and then rinse your hair with it, which can reduce oil production and make your hair more shiny.