Authors:

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 Bryson (2010). “Notes From A Big Country: Journey Into the American Dream”, p.121, Random House
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.