As a rule of thumb, I would submit that if you need to call your floss provider, for any reason, you are probably not ready for this level of oral hygiene.
Bill BrysonThe people are immensely likableโ cheerful, extrovert, quick-witted, and unfailingly obliging. Their cities are safe and clean and nearly always built on water. They have a society that is prosperous, well ordered, and instinctively egalitarian. The food is excellent. The beer is cold. The sun nearly always shines. There is coffee on every corner. Life doesn't get much better than this.
Bill BrysonLanguage is more fashion than science, and matters of usage, spelling and pronunciation tend to wander around like hemlines.
Bill Bryson