"Wake up with great hair every day. We'll put little capsules of dye just below your hair line. Your roots will never show."

That last was, of course, a lie. If you stopped paying the subscription fee, your hair quickly reverted to its original colour. If you couldn't afford the ever increasing costs and tried using third party dye, they sent people round to repossess your scalp.

https://shkspr.mobi/blog/2023/11/chapter-3-they-are-the-egg-men/