Have a Head Massage
Those head messages should be done more often. A good head massage stimulates a proper flow of blood to the head that ensures healthy glowing hair. Preferably use natural oils such as coconut or almond to stop further greying of white hair.
There are hair colours obviously, to cover the white hair you already have. Another option is Melancon tablet. These tablets rejuvenate the natural colour of your hair and stimulate hair follicles for melanin production. They are available online and will definitely reverse the entire grey and white hair problem for you.