so I've read that one shouldn't wash your mouth after brushing, but instead one should simply spit the toothpaste, leaving some (though not everyone seems to agree on this). well, I tried that for some days, and the result was that some food would stick in my tooth if I eat a couple of hours after brushing. does anyone know why this happens, and if it's really expected? I use colgate total 12 toothpaste, btw