Keratin Strings empowers you to make a choice - a receding hairline or baldness is not an inevitable problem. We at DHI promise to not just restore your hair, but also your confidence. Direct Hair Implantation (DHI) is the most advanced hair restoration technique in the world. This latest revolutionary technique eliminates the use of scalpels. There is no scarring and the procedure is pain free. With Direct Hair Implantation, single hair follicles are directly implanted into your scalp, with no incisions.