Dear Akshay I have noted your concerns. In this regard I want to suggest that Diode laser would be the best option for you. But please mind it that it is a hair reduction procedure that requires multiple sittings spaced at intervals that vary. Till date there is no permanent hair removal modality available. moreover, greying of hairs is irreversible. However, you can color or dye the hairs if that suits you but please be careful about tall claims and not get entrapped. Please see laser specialist to attend to your problem. everything will be fine if you do your homework carefully like checking the reputation of the center and talking to some of the patients who have received treatment from there,. The costs vary from one place to another and you can settle for one which suits your needs best