To use this tool, thread the floss through the eye of the holder and then move the threader between the tooth, pulling the floss through, says Dr. Lowenberg. If you have difficulty, consult your ...

They're perfect for when you need to floss on the go and normal flossing would be overly conspicuous or just gross (excuse me while I unspool this long thread in this gas station bathroom).

The same applies when you floss. Generally, we are taught to brush our teeth and then use floss to remove anything the toothbrush missed. Even at the dentist's office, they follow the same steps.