I'd be a lot more likely to floss if:
- the floss came in a purple, sparkly container
- the floss itself was purple
- ...and shimmery/glittery
- the floss glowed in the dark
- ...or was uv reactive, and the container had a tiny blacklight
- it tasted like raspberries, bubble gum, oranges, or other fun things (not grape!)
- the floss made funny noises while being used. Like squeaks, boings etc.
- the floss changed color, and I don't just mean from white to red (ouch)
- I'd get a reward for collecting empty floss containers - like a really cool tooth brush!