A Waterpik is a countertop or handheld device that shoots a thin, pulsating stream of water between your teeth and along your gumline to remove food debris and plaque. While “Waterpik” is technically a brand name (like Kleenex for tissues), it’s become the common term for any water flosser or oral irrigator. These devices work as an alternative or complement to traditional string floss, and clinical data suggests they can actually outperform string floss for plaque removal and gum health in several measurable ways.
How a Water Flosser Works
The device pumps water from a small reservoir through a motor that creates rapid pulses of pressure. You aim a narrow tip at the spaces between your teeth and along the gumline, and the pulsating stream does the cleaning through two distinct actions. First, there’s an impact zone right at the gumline where the water physically knocks plaque and debris loose. Second, there’s a flushing zone where the water pushes deeper beneath the gum margin, clearing out bacteria that a toothbrush can’t reach.
Countertop models plug into an outlet and offer a wider range of pressure settings, typically 10 to 100 PSI across up to 10 levels. Cordless models run on rechargeable batteries with fewer settings, generally between 45 and 75 PSI. If you have sensitive gums or are just starting out, you’ll want to begin on the lowest pressure and work your way up over a week or two as your gums adjust.
Water Flossing vs. String Floss
The most common question about water flossers is whether they actually work as well as regular floss. The short answer: the evidence is surprisingly favorable for water flossers. One clinical trial found that water flossing reduced whole-mouth plaque by 74.4%, compared to 57.7% for string floss. For the tight spaces between teeth specifically, water flossing achieved an 81.6% reduction versus 63.4% for string floss.
Gum bleeding tells a similar story. In a randomized trial comparing a water flosser to interdental brushes (small bristled picks designed for between teeth), the water flosser was 56% more effective at reducing bleeding across the whole mouth and 53% more effective between teeth. Multiple systematic reviews have confirmed that water flossers consistently reduce gingival bleeding and inflammation better than string floss, even in cases where visible plaque scores were similar between the two methods.
That said, a water flosser doesn’t physically scrape against the tooth surface the way floss does. Some dentists recommend using both, particularly if you’re prone to heavy tartar buildup in tight contact points. But for people who simply don’t floss because they find string floss tedious or painful, a water flosser is a significant upgrade over doing nothing.
Who Benefits Most
Water flossers are useful for almost anyone, but certain groups see outsized benefits. If you wear braces, the orthodontic tip (which has a small tapered brush at the end) lets you clean around brackets and wires that make traditional flossing nearly impossible. You glide the tip along the gumline, pausing at each bracket to brush and flush simultaneously.
People with dental implants have particularly strong reasons to use one. A systematic review published in BDJ Open found that water flossing reduced bleeding around implant sites by 81.8%, compared to just 33.4% for floss. The water stream also eliminated several types of harmful bacteria from the implant area that survived when patients used only a toothbrush. Since inflammation around implants (peri-implantitis) is one of the main reasons implants fail, keeping those sites clean matters enormously.
If you have bridges, crowns, veneers, or periodontal pockets, specialized tips exist for each situation. A plaque seeker tip has three small tufts of bristles that access hard-to-reach areas around dental work. A pocket tip is designed to gently deliver water or prescribed antimicrobial rinses deep into periodontal pockets where gum disease is active. All specialty tips should be replaced every three months.
How to Use One
Fill the reservoir with warm water. Select your tip and click it into the handle. Lean over the sink, place the tip in your mouth, and turn the unit on. Start at the back teeth and work your way around, pausing briefly at each space between teeth and along the gumline. Keep your lips mostly closed to prevent splashing, but let the water flow out of your mouth into the sink. The whole process takes about two minutes.
A few practical notes: warm water is more comfortable than cold, especially if you have sensitivity. You can add a small amount of mouthwash to the reservoir if you like, though plain water works fine for plaque removal. Always point the tip at a 90-degree angle to your gumline rather than straight down into the gum tissue. And if your gums bleed the first few times, that’s normal. It typically stops within a week or two of consistent daily use as your gum health improves.
ADA Recognition
Water flossers that carry the American Dental Association’s Seal of Acceptance have been independently tested and verified to safely and effectively remove plaque and reduce gingivitis. Not every model on the market carries the seal, so checking for it is a quick way to confirm you’re buying a device with clinical backing rather than just marketing claims.
Keeping Your Device Clean
A water flosser that isn’t cleaned regularly can develop mineral deposits and bacterial buildup inside the reservoir and handle. Once a month, run a solution of one part white vinegar to two parts warm water through the entire system, then follow it with a full reservoir of clean warm water. Soak the tip and handle in the same vinegar solution for five minutes.
The reservoir itself is usually dishwasher-safe on the top rack (with heated drying turned off), or you can hand-wash it with warm soapy water. Cordless models with narrower reservoirs benefit from a small bottle brush. If your reservoir has a rubber valve on the bottom, remove it and massage it under warm water for 30 to 45 seconds to prevent buildup from restricting water flow. Between uses, empty any remaining water from the reservoir so it doesn’t sit stagnant.