음파 전동칫솔 효과 있을까? 연구 결과와 올바른 사용법

Thinking of switching from a manual brush to a sonic electric toothbrush? The short answer: powered brushes in general remove a little more plaque and reduce gum inflammation slightly more than manual brushes, but how you brush still matters more than the number printed on the box. Here is what the research says, what the specs mean and how to brush properly.

What is a sonic electric toothbrush?

A sonic toothbrush has an elongated head similar to a manual brush. Its motor moves the head side to side very quickly with small strokes, usually advertised in hundreds of hertz (Hz).

• Oscillating-rotating brush: a small round head that rotates back and forth, cupping one tooth at a time.
• Sonic brush: an elongated head vibrating side to side at high speed, covering one or two teeth at a time.
• Manual brush: every movement comes from your hand, so results depend heavily on technique and patience.

The American Dental Association (ADA) lists several powered head movements, including side-to-side, rotation-oscillation and circular, and states that both manual and powered brushes remove plaque effectively (ADA).

What does the research say: do electric brushes clean better?

• Cochrane review by Yaacob et al. (2014): 56 trials, 51 of which (4,624 participants) were pooled. Compared with manual brushing, powered brushes reduced plaque by 11% at 1–3 months and 21% beyond 3 months, and gingivitis by 6% and 11% at the same time points. The evidence was rated moderate quality. PubMed
• In that review, 27 trials used rotation-oscillation brushes and only 10 used side-to-side brushes (the group that includes sonic models). Side effects were inconsistently reported; those reported were localised and temporary.
• The UK National Health Service (NHS) says it does not matter whether you use an electric or manual brush as long as you brush for about 2 minutes twice a day, though some people find it easier to clean thoroughly with an electric one (NHS).

Note that these figures average many types of powered brush, not sonic brushes alone, and the review dates from 2014.

Sonic or oscillating-rotating: which is better?

Van der Sluijs et al. (2022) pooled 32 randomised trials (38 comparisons, 2,805 participants) comparing the two types head to head. Oscillating-rotating brushes came out slightly ahead on some plaque and gum-bleeding indices, with no difference on others. The authors themselves describe the difference as small. About 62% of the included studies had commercial funding, and there were signs of publication bias (PubMed, Dental Elf commentary).

In other words, the gap between the two powered designs is far smaller than the gap between brushing for a full 2 minutes and rushing it. Choose the type you find comfortable and will use every day.

What do Hz and “vibrations per minute” tell you?

Hz is the number of vibration cycles per second; some brands quote vibrations per minute instead. The figure tells you how fast the head moves and whether the buzz feels strong or gentle. Lower frequencies tend to feel softer, which suits people moving over from a manual brush.

What the number does not tell you:

• How much cleaner the brush is. The reviews above compare types of motion, not Hz ratings.
• How gentle it is on gums — that depends mostly on how hard you press and how soft the bristles are.

Brands may count differently, so avoid converting Hz to vibrations per minute mechanically to compare products from different makers.

Who should consider a sonic electric toothbrush?

• People with braces: the ADA notes that people with appliances such as braces may find a powered brush easier to use. A review by Liu et al. (2026) of 23 papers (39 comparisons) in patients with fixed braces found powered brushes may improve plaque and gum scores, but the evidence was low quality and should be interpreted with caution (European Journal of Orthodontics). You still need to clean around brackets — see water flossers for braces and implants.
• People with limited dexterity: older adults, people with disabilities and children — groups the ADA mentions.
• People with sensitive teeth or gums: pick a model with a Sensitive or Soft mode, use a soft head and do not press hard. If sensitivity persists, see a dentist to find the cause.

How to brush properly with a sonic electric toothbrush

1. Use a fluoride toothpaste, and put the head in your mouth before switching on to avoid splatter.
2. Angle the bristles at about 45° towards the gumline, as the ADA recommends (MouthHealthy – ADA).
3. Do not scrub back and forth as with a manual brush. Hold the head lightly on each tooth for a few seconds, then glide to the next.
4. Divide your mouth into 4 sections, about 30 seconds each, for 2 minutes in total.
5. Do not press hard: bristles splaying out sideways mean you are using too much force.
6. Spit out the toothpaste but do not rinse straight away, so the fluoride stays on your teeth, as the NHS advises.
7. Replace the brush head about every 3 months, sooner if the bristles are frayed; the ADA advises replacing toothbrushes every 3–4 months.

A toothbrush only cleans tooth surfaces. Between the teeth you still need floss or a water flosser — read water flosser or string floss: what the research says.

Inmax sonic toothbrush options

All the models below have a 1,200 mAh battery, USB Type-C charging and IPX7 water resistance:

• M1: 120–140 Hz, the lowest frequency in the M range, so it vibrates gently — a good fit for first-time users; 5 modes including Sensitive.
• M3: same 235 mm body and 5 modes as the M1 (including Sensitive), 248–320 Hz, with 2 extra brush heads in the box.
• M2, M2 Pro, M2 Art: cylindrical handles with a display showing mode icons, all with a Soft mode. M2: 120–280 Hz with a Custom mode; M2 Pro: 150–250 Hz, 135 g; M2 Art: 250–400 Hz, 136 g; the Pro and Art add a Strong mode.
• M5: a slim 199.4 mm body, 20,000 vibrations per minute, with Gum Care and Sensitive modes.

Browse the full electric toothbrush range, compare specifications or contact Inmax for advice. Resellers can see our dealer policy.

Frequently asked questions

Can a sonic toothbrush damage tooth enamel?

The Cochrane review found side effects were rarely reported and, when reported, localised and temporary. The main risk comes from pressing too hard, not from the vibration itself.

Is a higher frequency always cleaner?

The studies we reviewed do not rank cleaning performance by Hz. Choose a vibration level you find comfortable so you keep brushing for the full 2 minutes.

Can children use one?

Children can use an electric brush with a suitable head, but they need an adult to guide and supervise them. Ask a dentist if your child is having dental treatment.

This article is for general information only, compiled from the linked sources, and does not replace advice from your dentist.