#1 String Floss brand recommended by Canadian Dental Hygienists*. Our Fine Floss glides easily between tightly spaced teeth.GUM® Fine Floss is perfect for people who find ordinary dental floss challenging to get between their teeth.Our Fine Floss is designed with thin strings that enable you to get into the tightest between-teeth spaces and dislodge food particles and dental plaque. Make sure you're getting between the teeth to remove food particles and dental plaque that you can't reach by brushing alone. This thin, shred-resistant floss works its way into and out of tight interdental spaces.