Use a water flosser at least once daily, ideally before brushing your teeth. Flossing first dislodges food and plaque from between teeth, allowing the fluoride in your toothpaste to reach more tooth surface when you brush afterward. This sequence has been shown to reduce plaque more effectively and strengthen enamel against decay. Beyond daily timing, a water flosser is especially valuable if you have braces, dental implants, gum disease, or any dental work that makes string floss difficult to maneuver.
Before Brushing, Not After
The order matters more than most people realize. The American Association of Orthodontists recommends flossing before brushing because clearing debris first lets fluoride from toothpaste penetrate the spaces between teeth more effectively. If you brush first, a layer of loosened plaque and food particles can block fluoride from reaching enamel surfaces where it does the most good.
The routine is straightforward: water floss once daily (at night works well), then brush immediately after. If you have braces, implants, bridges, or active gum disease, your dentist may recommend using it twice a day until things are under control.
How Water Flossing Compares to String Floss
Water flossers consistently outperform string floss in clinical studies. In one trial, a water flosser reduced whole-mouth plaque by 74.4% compared to 57.7% for string floss. For the surfaces between teeth specifically, the gap was similar: 81.6% reduction with a water flosser versus 63.4% with string floss. The pulsating water stream reaches areas that string floss physically can’t access, particularly below the gumline.
That said, both methods work. String floss is better than nothing, and some dentists still prefer it for certain patients. The real advantage of a water flosser is that most people actually use it consistently because it’s faster and easier, especially for hard-to-reach spots.
Braces, Implants, and Dental Work
If you have fixed orthodontic appliances, a water flosser becomes close to essential. Brackets, archwires, and elastics create dozens of tiny spaces where food and plaque collect, and studies estimate that 20 to 40% of patients with braces have poor plaque control with a toothbrush alone. Threading string floss under archwires is tedious enough that many people skip it entirely.
A clinical trial comparing water flossing to interdental flossing in orthodontic patients found both methods significantly reduced plaque and gum bleeding after two weeks. The water flosser group saw a 21.87% median reduction in plaque index and a 32.29% reduction in gum bleeding, slightly outperforming the interdental floss group’s 16.13% and 23.57% reductions. The difference wasn’t statistically significant in that small trial, but the practical advantage is clear: water flossing around brackets takes a fraction of the time.
Water flossers have also been shown to reduce gum inflammation and harmful bacteria around implants, crowns, and bridges. Any dental work that creates tight margins or hard-to-reach surfaces is a good reason to pick one up.
Gum Disease and Deeper Pockets
For people with early to moderate gum disease, water flossers offer a specific clinical benefit. The pulsating stream creates two cleaning zones: an impact zone right at the gumline and a flushing zone that pushes water below the gum margin. Studies show this action can penetrate 90% of periodontal pockets that are 6 mm deep or less, clearing bacteria without damaging soft tissue. Even in deeper pockets of 7 mm or more, the water reaches about 68% of the pocket depth.
Beyond mechanical cleaning, the pulsating action reduces inflammatory markers in the fluid around your gums. This is particularly beneficial for people who have both gum disease and diabetes, where inflammation tends to be more persistent. If your dentist has told you that you have periodontal pockets, using a water flosser daily can help manage bacteria in those spaces between professional cleanings.
Proper Technique
Hold the tip at a 90-degree angle to your teeth and aim the stream along the gumline, not directly at the flat surface of the tooth. Pause briefly between each tooth so the pulsating water has time to flush debris from the gap. Follow the natural curve of your gums as you move from tooth to tooth.
Work systematically to avoid missing spots. Start with the back teeth on one side and move toward the front, cleaning the outer surfaces (cheek side) first, then the inner surfaces (tongue side). Cover all four quadrants. The whole process takes about a minute once you have a routine. If you’re new to water flossing, start on a lower pressure setting and increase gradually as your gums adjust. Some initial bleeding is normal for the first week or two, especially if your gums are already inflamed.
What to Put in the Reservoir
Plain warm water works perfectly for daily use. If you want an extra antimicrobial boost, you can add antiseptic mouthwash to the reservoir at no more than a 1:1 ratio with warm water. Prescription therapeutic rinses like chlorhexidine are also safe to use, but follow your dentist’s specific dilution instructions for those.
After using any additive, rinse the unit by partially filling the reservoir with plain warm water and running it with the tip pointed into the sink. This prevents buildup inside the tubing and keeps the device functioning properly. Even with plain water, emptying the reservoir after each use and leaving the lid open helps prevent mold or mineral deposits.
Which Models Have ADA Approval
The American Dental Association’s Seal of Acceptance program tests products for both safety and efficacy. As of 2025, several Waterpik models carry the ADA Seal, including their countertop water flossers, battery-operated models, and the Sonic-Fusion combined toothbrush/flosser. The Seal specifically certifies these devices for helping remove plaque and helping prevent and reduce gingivitis. No other water flosser brand currently holds the ADA Seal, though that doesn’t necessarily mean other brands are ineffective. It means they haven’t submitted to or completed the ADA’s testing process.