Tăm nước hay chỉ nha khoa? Nghiên cứu khoa học nói gì

A toothbrush cleans the outer and chewing surfaces of teeth well. The spaces between teeth and along the gumline — where plaque builds up most — need a separate cleaning step. The two most common options today are string floss and the water flosser. This article summarises what research actually shows, including the points science has not settled yet.

Two tools that clean in different ways

String floss slides between teeth and scrapes plaque off by friction. A water flosser fires a pulsing, pressurised stream of water to flush food debris and plaque out of the gaps and along the gums. Speaking to VnExpress, dental specialist Dr. Bùi Thị Loan Chi (Military Hospital 175) explained that the device uses water pressure to remove food particles (translated), and is especially useful for people wearing braces and gentle on gum tissue.

What the studies show

Studies favouring the water flosser

• Goyal et al. (2013): 70 adults, compared after a single use. Whole-mouth plaque fell 74.4% with a water flosser versus 57.7% with string floss; between the teeth the figures were 81.6% versus 63.4%. Abstract on PubMed
• Barnes et al. (2005): a 28-day trial. Both water-jet groups reduced gum bleeding significantly more than the floss group at day 14 and day 28. PubMed
• Rosema et al. (2011): 108 people over 4 weeks. The water flosser group had lower gum-bleeding scores than the floss group, with no difference in plaque. PubMed

Worth knowing: all three studies above include a co-author employed by water flosser maker Water Pik. They are peer-reviewed and published in dental journals, but readers should keep this link in mind when weighing the numbers.

Independent studies and systematic reviews

• Abdellatif et al. (2021, independent): 83 people in a split-mouth design. String floss removed 89.09% of interdental plaque and the water flosser 87.23% — not a statistically significant difference. In other words, the two were about equally effective. PubMed
• Cochrane review (2019): 35 trials with 3,929 adults. A water flosser plus brushing may reduce gingivitis at 1 month, but the certainty of evidence is low to very low and no difference was seen at 3 and 6 months. PubMed
• American Dental Association (ADA): water flossers carrying the ADA Seal have been tested as safe and effective at removing plaque, and are an option for people who struggle to floss by hand or who wear braces or bridges. MouthHealthy (ADA)

So which should you choose?

The honest conclusion from the research: a water flosser is not “miraculously” better than string floss, but it is not worse either. What matters is cleaning between your teeth every day — whichever tool helps you keep that habit is the best tool for you.

• Choose string floss if: your teeth are tightly spaced, you already floss with good technique and you want the lowest cost.
• Choose a water flosser if: you wear braces or have bridges or implants; your gums bleed easily with floss; you have limited dexterity (older age, arthritis); or you keep skipping floss because it is a hassle.
• Use both: many dentists suggest floss for tight contacts and a water flosser for a whole-mouth rinse along the gumline.

Three points every recommendation agrees on

1. Neither floss nor a water flosser replaces your toothbrush. Vinmec states plainly that a water flosser cannot replace brushing (translated).
2. Brush twice a day, clean between your teeth once a day and see your dentist regularly.
3. Gums that keep bleeding, swell or hurt need a dentist's check — a water flosser is not a treatment for gum disease.

If you choose a water flosser, what to look for

Look for several pressure settings (start low), a reservoir large enough for a full-mouth session, a water-resistance rating for bathroom use and easy-to-find replacement tips. Officially imported products carry a Vietnamese sub-label and a clear warranty. You can browse Inmax water flosser models, compare specifications or read are water flossers worth it.

Resellers, pharmacies and shops looking for stock can request dealer pricing — Inmax imports through official channels and ships within 48 hours from Hanoi and Ho Chi Minh City.

This article is for general information, compiled from the sources linked in each section; it is not a substitute for advice from your dentist.