You would spend much more than 10 hours on dentists appointments if you don't do this. Brushing and flossing properly cannot be stated as a loss of anything - time, money, health, whatever, no matter how you try to frame it. Don't delude yourself and others.
Additionally, you may not notice it but it you don’t floss you are likely to have bad breath due to the food trapped between your teeth (it depends on the gaps between your teeth but any food that sits in your mouth will eventually smell like shit). Outside of the other benefits of flossing, knowing that my breath smells better and not worrying about it is worth the 5-10 minute effort once a day.
