1. Traditional string dental floss gives you much more control over the positioning and movement of the floss. The point of flossing your teeth is not simply snapping the string up and down between your teeth but to actually remove the food and plaque particles accumulating in between your teeth before it has a chance to harden and get stuck onto your teeth. As you improve your flossing technique, which becomes more and more important with age, you will start to realize that how you use the floss makes a difference on the outcome. Getting the dental floss below the gumlines and moving it back and forth by hugging the front and back tooth surface is much more effective than simply snapping the dental floss up and down. Using a traditional dental floss gives you much more control by using your two hands and allows you to better maneuver it. Conversely, floss-picks have a hard time going beneath your gums and an even harder time properly moving back and forth to remove all the accumulated food and plaque. As a result you get a much better cleaning when using regular dental floss over a floss-pick.
2. Less chance of transferring harmful bacteria between your teeth. One major advantage of using traditional dental floss is the ability to allocate a clean segment of the floss string to go in between each gap. When using a floss-pick you are stuck using the same half-an-inch dental floss string to clean in between all of your teeth surfaces. This can harbor and transfer bacteria from one site to the next which may have adverse effects on your teeth and gums. With a traditional dental floss you can roll the floss string around your finger after every few uses to dedicate a new segment to each region of your mouth thus reducing the possibility of cross-contamination.
3. More economical option. Using traditional dental floss will cost you much less than using a floss-pick. Considering that you have to use a new floss-pick each and every time you want to floss in between your teeth whereas a single dental floss dispenser should last you for several months.