You know you're supposed to clean between your teeth every day. But the debate between traditional floss and a water flosser (water pick) is real — dentists disagree, patients have strong opinions, and the internet gives you a different answer depending on where you look.
This guide gives you an honest, evidence-based comparison of both options so you can make the right choice for your mouth.
The honest answer upfront: Both work. The best one is the one you will actually use consistently every single day. That said, each has real advantages for different situations — and understanding them helps you choose wisely.
What each one actually does
Traditional Floss
- Physically scrapes the sides of each tooth as you guide it through the contact point
- Removes plaque biofilm from tooth surfaces between teeth
- Slides under the gumline to clean the sulcus (pocket around each tooth)
- Disrupts and removes the plaque before it can harden into tartar
Water Flosser
- Uses a pressurized stream of water to flush debris and bacteria from between teeth
- Excellent at removing loose food particles and flushing the gumline
- Reaches areas that floss physically cannot — around braces, implants, bridges, and crowns
- Significantly reduces gum inflammation and bleeding in clinical studies
What the research actually shows
Multiple clinical studies have compared water flossers to string floss. The consistent finding is that water flossers are at least as effective as string floss for reducing gum inflammation and bleeding — and in some studies, more effective. For plaque removal specifically, the evidence slightly favors string floss because it physically scrapes the tooth surface.
However, the most important finding across studies is this: people who use a water flosser are significantly more likely to use it consistently than people who floss with string. Consistency is what produces results. An imperfect tool used every day beats a perfect tool used twice a week.
Who benefits most from each
Traditional floss is best if:
- You have tight contacts between teeth (floss is better at squeezing through)
- You're disciplined enough to floss correctly every day
- You want the most direct plaque removal from tooth surfaces
- You travel frequently and don't want to carry a device
Water flosser is best if:
- You have braces — flossing around brackets and wires is extremely difficult with string
- You have a dental bridge — you cannot thread string floss under a bridge without a threader
- You have dental implants — water flossers are gentler around implant tissue
- You have gum disease or deep pockets — water can flush bacteria from deeper than floss can reach
- You have dexterity issues — manipulating string floss is physically difficult for some people
- You hate flossing and never do it — a water flosser you use every day beats string floss you avoid
Proper technique for each
String floss — the C-shape method
- Use about 18 inches of floss. Wind most around your middle fingers, leaving 2 inches to work with.
- Slide the floss gently between teeth using a zigzag motion — never snap it into the gums.
- Curve the floss into a C-shape around each tooth and slide it up and down against the tooth surface, going just below the gumline.
- Use a fresh section of floss for each tooth.
Water flosser — technique tips
- Start on the lowest pressure setting until you're comfortable
- Aim the tip at a 90-degree angle to the gumline
- Pause briefly between each tooth to let water flush out
- Work from back to front on both upper and lower teeth
- Lean over the sink — it can get messy until you have the technique down
The verdict
If you floss with string correctly every single day, you don't need a water flosser — though adding one provides additional benefit. If you have braces, implants, bridges, or gum disease, a water flosser is genuinely the better tool. If you hate flossing and never do it, a water flosser you'll actually use every day is infinitely better than string floss sitting untouched in your drawer.
The best approach for most people: use a water flosser daily as your primary interdental cleaner, and use string floss when you want to ensure maximum plaque removal from tight contacts.