Earlier quoted context omitted.
> I don't have gaps in my teeth to get the floss in. Same here. Never understood how people can physically floss. Maybe those with undeveloped teeth can do it, others, I don't see how it's even possible.
I use one of these: http://imgur.com/8A3dopG For some teeth, I have to force it a little, my teeth are pretty close too. Its so worth it though: much better breath, clean feel, minimized risk of cavities.
Having a loop allows to have a firm hold on the floss and adjust tension. I use it with both hands though. And I waste very little floss because I can rotate the loop and use every inch of it.