Lately, I have been thinking about the wasteful use of toothbrushes. I assume that most people replace their toothbrushes every 4-6 weeks. This, of courses, generates a lot of plastic waste. 

I guess it is not in the interest of the industry to produce everlasting toothbrushes. However, my question to you, would it be technically possible to produce everlasting (or at least) longer lasting toothbrushes?