I'm sorry but not flossing kind of tells me everything I need and want to know about your dental hygiene. Also, I'm sure it has something to do with his gums bleeding. They're probably inflamed afff, partly from not flossing. I totally understand and empathize with not being able to afford it, but what excuse do you have when someone else offers to pay for it? Clearly, he's not too concerned about his oral hygiene. Yikes.