Zoom Whitening in Seoul
A single chair-side whitening session using professional gel and light activation. Here is exactly what happens in the chair, who is suitable, and how to keep the result.
- Since 2002
- 13 dentists
- In-house lab
- EN · 中文 · 日本語
What is Zoom whitening and how long does it take?
Zoom whitening is a professional in-office treatment in which a whitening gel is applied to the teeth and activated with a light, usually in three or four 15-minute cycles. The full appointment typically takes 1 to 1.5 hours. At Gangnam One Day Dental Clinic, the teeth and gums are examined first, because restorations do not whiten.
Reviewed by Dr. Kim Jin-hwan , Chief Director · Updated October 5, 2026
What happens in the chair
Zoom is an in-office method, so everything is done in one appointment. After an examination and shade record, your lips and cheeks are held back with a retractor and a protective barrier is painted over the gums. Only the visible front surfaces of the teeth are exposed to the gel.
The whitening gel is applied and activated with a light for about 15 minutes, then removed and reapplied. Most patients have three or four cycles. The team watches your comfort between cycles and can stop early if sensitivity builds. Your final shade is recorded against the starting shade.
- Gum barrier protects soft tissue from the gel
- Gel refreshed every cycle for even action
- Shade photographed before and after
- Desensitising gel can be applied at the end
Zoom compared with other whitening options
Zoom gives the fastest visible change, which suits visitors with only a day or two in Seoul or patients with an event coming up. Take-home trays work more slowly but are gentler and easy to repeat. Our teeth whitening in Seoul page compares all the options side by side.
Many patients combine one Zoom session with take-home trays. The in-office session gives the head start, and the trays deepen and stabilise the shade over the next 1-2 weeks after you return home.
Not sure if this is right for you? Send a photo or X-ray — a dentist replies on WhatsApp in English, Chinese or Japanese.
Get a free opinionBefore you book: suitability check
Zoom gel does not whiten crowns, veneers, fillings or bonding. If these are on your front teeth, they may look darker afterwards. The dentist points this out at examination so you can decide whether to replace them after whitening.
Untreated cavities, cracked teeth, exposed roots and inflamed gums make in-office whitening uncomfortable and should be treated first. If you already have sensitive teeth, the dentist may suggest a shorter session or take-home trays instead.
| Zoom in-office | Take-home trays | |
|---|---|---|
| Time in clinic | About 1-1.5 hours | Short visit for scan and tray fitting |
| Time to visible result | Same day | About 1-2 weeks |
| Gel strength | Higher, applied by the dental team | Lower, applied at home |
| Sensitivity | More likely, usually 24-48 h | Usually mild |
| Best for | Short stays, events | Gradual change, top-ups |
How it works at Oneday Dental
- Before visit
WhatsApp check
Send a smile photo and tell us about crowns, veneers or fillings on your front teeth and any sensitivity.
- Appointment
Examination and shade record
The dentist checks teeth and gums and records your starting shade. Cleaning may be advised first.
- Appointment
Gum protection
A retractor and gum barrier isolate the teeth so only enamel contacts the gel.
- Appointment
Gel and light cycles
Usually three or four cycles of about 15 minutes, with comfort checked between cycles.
- Next 48 hours
Aftercare
Avoid coffee, tea, red wine, curry and smoking for 48 hours. Use toothpaste for sensitive teeth if needed.
Things to know before you decide
- Temporary sensitivity or 'zingers' are common and usually settle within 24-48 hours.
- Crowns, veneers, fillings and bonding do not change colour.
- Not advised during pregnancy or breastfeeding, or with untreated decay, cracks or gum disease.
- Results vary; grey or deep internal stains lighten less predictably than yellow stains.
Experience you can check
- 2002Founded in Gangnam — 24 years
- 13Dentists in 5 departments
- 3Clinic buildings, 1,570 m²
- 0.01 mmT-Scan bite-force detail
Vice President, Korean Academy of Stomatognathic Function & Occlusion · author on T-Scan implant occlusion (IGI Global)
Zoom Whitening: common questions
How many shades whiter will Zoom make my teeth?
Is Zoom whitening painful?
What should I avoid eating after Zoom whitening?
Can I fly home the day after Zoom whitening?
Does Zoom whitening damage enamel?
How much does Zoom whitening cost in Seoul?
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