The first reason is congenital, and there is a whirling hair growing at the root of bangs. The first reason is acquired. Sticking bangs together for a period of time will lead to the deformation and upward growth of bangs' hair follicles, which will lead to the change of hair growth direction. No matter what the reason, it will not cause hair to bend. As long as your hair is not naturally curly, it will grow straight. Besides, don't cut off from the root cause, there will be trouble in the future. Softening the roots of bangs is the best choice.