When someone has no other option or is forced to floss his or her teeth with their pubes. You must get in between at least 4 different teeth for it to be considered a pubic floss. It is also acceptable to floss with someone elses pubes. If the person has pubic lice and it gets on their teeth it is called Tooth fariculous fibrosis.
When my regular floss ran out my only other option was to pubic floss.