Shaun Pulfrey became known for creating the Tangle Teezer hairbrush after pitching the concept on British Dragon's Den.
Pulfrey developed the product while working as a hair colourist. He wanted a brush that could remove knots with less pulling and discomfort than conventional designs. The Tangle Teezer uses flexible teeth arranged to move through tangled hair, including wet hair.
Pulfrey's Dragon's Den appearance did not produce an investment deal. The product's later growth came through continued development, marketing and sales after the broadcast. Its success is therefore often used as an example of the promotional value of appearing on the programme even when no Dragon makes an offer.
The answer is Shaun Pulfrey, not a Dragon. The programme's investors are frequently attached to successful products in public memory, but Pulfrey remained the inventor and founder of the Tangle Teezer business.