If you've ever stood in the dental care aisle wondering whether to pick up a water flosser or just stick with the roll of string floss, you're not alone. It's one of the most common questions people ask, and the answer is a little more nuanced than a simple either/or.

Here's what the research actually says, and what might work best depending on your situation.

What Is Traditional String Flossing?

Traditional flossing involves sliding a thin strand of dental floss between each tooth and gently scraping along the sides to remove plaque and food debris. It's been the standard recommendation from dentists for decades and is well-supported by research.

When done correctly and consistently, string floss effectively removes plaque from between teeth and just below the gumline, areas that toothbrushes simply can't reach.

What Is Water Flossing?

A water flosser (also called an oral irrigator) uses a pressurised stream of water to clean between teeth and along the gumline. You direct a thin jet of water into the spaces between your teeth, and the pulsating pressure flushes out food particles and disrupts plaque buildup.

Water flossers have become increasingly popular, particularly among people who find traditional flossing difficult, uncomfortable, or time-consuming.

What Does the Research Say?

Several clinical studies have compared the two methods, and the results are worth knowing:

• A study published in the Journal of Clinical Dentistry found that a water flosser was 51% more effective at reducing gingivitis than string floss.
• The same study found water flossing removed 29% more plaque than string floss.
• For people with braces, implants, crowns, or bridges, water flossers significantly outperform string floss, they can clean around brackets and under dental work where string floss struggles or can't reach at all.
• String floss, when used properly, is still considered highly effective at removing plaque from tight contact points between teeth.

The honest takeaway: both methods work. The better question isn't which one wins, it's which one you'll actually use consistently.

When Water Flossing Works Better

• You have braces, dental implants, bridges, or crowns
• You have gum disease or have been told you have deep gum pockets
• You find string flossing painful, difficult, or time-consuming
• You have arthritis or limited dexterity that makes handling string floss awkward
• You want a quicker, easier daily routine that you're more likely to stick to

When Traditional String Flossing Works Better

• You want to physically scrape plaque from very tight contact points between teeth
• You're looking for the most affordable option
• You already have a consistent flossing habit that's working well for you
• You prefer a method that requires no charging or refilling

Can You Use Both? 

Yes, and many dentists actually recommend it. Using a water flosser for its gum-flushing benefits and following up with string floss for tight contact points gives you the advantages of both methods.

That said, if you currently don't floss at all, starting with a water flosser is significantly better than doing nothing. The most effective flossing method is the one you'll actually do every day.

Tips for Getting the Most Out of Water Flossing 

• Start with the lowest pressure setting and work up gradually
• Aim the tip just below the gumline at a 90-degree angle
• Work systematically, go around all teeth in one direction, then the other
• Use lukewarm water, it's more comfortable than cold
• Do it before brushing so your toothbrush can clean away anything dislodged

Frequently Asked Questions

Is water flossing as effective as string flossing?

Research shows water flossing is at least as effective as string flossing for reducing plaque and gingivitis, and in some studies, more effective. For people with dental work or gum issues, it often outperforms string floss significantly.

Can I replace string floss with a water flosser?

Many people do, and for most situations it works well. Some dentists suggest keeping both in your routine for optimal results, but if water flossing means you'll actually floss daily versus string flossing you'll skip, water flossing is the better practical choice.

How long should I water floss for?

A full water flossing session typically takes 60-90 seconds. That's enough time to work around all your teeth and along the gumline thoroughly.

Is water flossing safe for sensitive gums?

Yes, most water flossers have adjustable pressure settings, so you can start gentle and increase gradually. Many people with sensitive gums actually find water flossing more comfortable than string floss, which can cause irritation when technique isn't quite right.

How often should I floss?

Once a day is the standard recommendation. The best time is before bed so you're removing the day's buildup before you sleep, but any consistent time that works for you is better than none.