Todd Greene built a brand around what he calls "Head Care," a combination of head shaving and skin care. His invention, the HeadBlade, makes head shaving easier for the millions of people who shave their heads. Here he tells the story of how he came up with the HeadBlade, and grew it from an idea to a successful business.Inventor Todd Greene poured a year of his life, plus $150,000, and had a rather underwhelming first day of sales: Sold 8 out of 500 HeadBlades. He kept going, at the behest and rationale from his wife. He believed in his invention so passionately that selling them was just a matter of time.