At Yeonhap Dental Clinic, whitening gel is applied and activated with light three times in a single visit using Osstem Beautis15, and we look at the shade again 1–2 weeks later to decide whether to add more. This article covers how the procedure is done, how shade is assessed and maintained, sensitivity and aftercare, and what to check before treatment.
What is one-day teeth whitening, and when can you judge the result?
There are not many ways to change tooth color without cutting or covering the tooth, and teeth whitening (a treatment in which whitening gel is applied to the tooth surface to break down the pigments inside the tooth) is one of them.
[Key Answer]
One-day teeth whitening is an in-office whitening treatment in which applying whitening gel and shining light is done three times in a single visit. Our clinic uses Osstem Beautis15 (about 15% hydrogen peroxide). Right after the procedure the teeth can look temporarily brighter than they really are, so we check the shade again 1–2 weeks later and decide whether additional treatment is needed.
[4-Line Summary]
· We use Osstem Beautis15 and perform gel application and light activation three times in one day; whether to add more is decided by looking at the shade 1–2 weeks later.
· Allow about 1 hour 30 minutes for shade recording, surface cleaning, gum protection, and finishing.
· Right after the procedure teeth can look brighter than they really are, so the final shade is judged after about 2 weeks.
· Composite resin and crowns do not lighten like natural teeth, so we check them before treatment together with your age, pregnancy status, and the cause of discoloration.
Written by: Dr. Ahn Seong-jin, Chief Director, Yeonhap Dental Clinic
[Table of Contents]
· How does Yeonhap Dental Clinic perform one-day teeth whitening?
· When is the shade assessed after one-day teeth whitening, and how long does it last?
· How are sensitivity and aftercare handled after one-day teeth whitening?
· What should be checked before one-day teeth whitening?
How does Yeonhap Dental Clinic perform one-day teeth whitening?
We apply the gel and activate it with light three times, and we allow about 1 hour 30 minutes including shade recording, surface cleaning, gum protection, and finishing.
First, we record your current shade with photos and a shade guide (a set of tooth-color samples), remove tartar and surface stains (tooth surface cleaning), and apply a gum protector along the gum line and let it set. Then Osstem Beautis15 is applied at a thickness of 2 mm and activated with light, three rounds in all, and we shorten the last round depending on how sensitive your teeth feel. Home whitening with trays worn every day depends on how long the trays are worn, so we do not combine it with in-office treatment.
When is the shade assessed after one-day teeth whitening, and how long does it last?
Right after the procedure the teeth are dehydrated and can look brighter than they really are, so we assess the shade again 1–2 weeks later.
The Beautis15 product approval information also states that the shade right after treatment can look whiter than the final shade, and that the final shade is determined after about 2 weeks (MFDS approval information). At that point we look again with the same shade guide, and if you would like it brighter, we check the condition of your teeth and gums and how sensitive they are, then decide whether to add 1–2 more sessions.
After that, the shade fades gradually depending on the cause of discoloration and your habits, and at our clinic we usually explain that it fades little by little over about a year and a half to two years. In a study that followed 50 people treated with a different in-office whitening agent (35–40% hydrogen peroxide) for 18 months, the shade stayed within a clinically acceptable range for most products (Gönüllü 2026). There is no set interval for repeat treatment; we recheck your teeth and gums and decide when you would like to do it.
Shade assessment over time after one-day teeth whitening
| Timing | Change in shade | What we do at our clinic |
|---|---|---|
| Right after treatment | May look brighter because of temporary dehydration | Go home after sensitivity treatment |
| 1–2 weeks later | Moisture returns and the shade settles | Reassess with the same shade guide and decide whether to add more |
| Afterward | Changes gradually depending on the cause of discoloration and your habits | If you wish, we reassess and repeat the treatment |
How are sensitivity and aftercare handled after one-day teeth whitening?
Sensitivity is a common, temporary reaction after whitening, so we prepare in advance with a desensitizing agent and pain medication right after the procedure.
Right after the procedure we apply a desensitizing agent containing potassium nitrate and fluoride, leave it on for about 5 minutes before you go home, and also prescribe pain medication. There is a meta-analysis showing that desensitizing agents with these ingredients reduced sensitivity during whitening (Wang 2015), and the Beautis15 approval information states that sensitivity is temporary and goes away after 1–3 days. It is usually temporary, but if the pain is severe or persists, you should be examined at a dental clinic.
We advise you to avoid food and smoking for 2 hours after the procedure, and to cut back on staining foods such as coffee and tea for the following 1–2 weeks. For a few days it is more comfortable to avoid very cold or very hot foods, and white spots caused by dehydration disappear within 1–2 weeks. After that, how often you drink coffee or tea and whether you smoke affect how long the result lasts.
What should be checked before one-day teeth whitening?
In line with the conditions for using Beautis15, we first check your age, pregnancy and breastfeeding status, the cause of discoloration, and any oral disease.
If the product is not indicated, as with tetracycline staining or fluorosis, we discuss other options, and if there is untreated tooth decay or gum disease, that is treated first. Composite resin and crowns do not lighten the way natural teeth do, so if the color difference bothers you after whitening, we discuss replacement once the shade has stabilized, and we also decide the timing of resin bonding together. Resin materials are summarized in our filling materials column.
Conditions to check before one-day teeth whitening (Yeonhap Dental Clinic)
| Item | When whitening can proceed | When we consult or treat first |
|---|---|---|
| Cause of discoloration | Yellowing of the natural tooth that remains after surface stains are removed, or age-related discoloration | Tetracycline staining, fluorosis |
| Age and general health | 18 or older | Under 18, pregnant or breastfeeding |
| Cavities and gums | Treatment completed, or none | Untreated cavities, severe gum disease |
| Restorations | None, or the color difference is acceptable | Concerned about color difference with front-tooth resin or crowns |
| Sensitivity | None | Already has sensitive areas |
3 things to check when considering one-day teeth whitening in Gwonseon-gu and Tap-dong, Suwon
· Whether your current shade is recorded with a shade guide before treatment and reassessed against the same standard 1–2 weeks later
· Whether the conditions for using the product, such as age, pregnancy status, and the cause of discoloration, are checked first
· Whether the color difference of resin and crowns and the management of sensitivity are explained before treatment
[Key Takeaways]
✓ At Yeonhap Dental Clinic, gel application and light activation are done three times in one visit with Osstem Beautis15, and we allow about 1 hour 30 minutes including preparation and finishing.
✓ Teeth can look brighter right after treatment, so we reassess the shade 1–2 weeks later and decide whether to add more.
✓ Resin and crowns do not lighten like natural teeth, so if the color difference bothers you, we discuss replacement once the shade has stabilized.
A Few Words from the Treatment Room About Teeth Whitening
In a whitening consultation, I first record your current shade with a shade guide, then check whether you have resin or crowns on your front teeth, and whether you have sensitive areas or untreated cavities. If your original shade is dark or the resin on your front teeth is large, a single session may not reach the shade you want, or the resin may look different in color, so I explain that possibility before treatment. In practice, when patients come back 1–2 weeks later, more of them say their teeth turned out whiter than expected than say they are disappointed, and they split between stopping there and doing one or two more sessions to go brighter. That is why I decide the next step with you based on the shade at 1–2 weeks, not the shade on the day.
References
📋 Treatment Information
This post was written in compliance with the Korean Medical Service Act and the Ministry of Health and Welfare's medical advertising guidelines, and is intended to provide medical information. It does not guarantee or assert the effect of any specific treatment. The result, duration, and degree of sensitivity of teeth whitening vary from person to person depending on the cause of discoloration, oral condition, and habits, so please be sure to consult fully with your dental team before deciding whether to proceed.
🦷 Aesthetic dentistry information: Yeonhap Dental Clinic Aesthetic Dentistry
📍 5th Floor, 230 Geumho-ro, Gwonseon-gu, Suwon, Gyeonggi-do (Tap-dong, Cham Clinic Building)
🚕 Across from Suwon NongHyup Guun Branch (231 Geumho-ro) / about 15 minutes by taxi from Suwon Station
🚗 Free parking available in the building
📞 031-293-2207
🌐 yeonhapdental.com
🟡 Opened in 2002 / Treatment overseen by Dr. Ahn Seong-jin, Chief Director and Integrated Dentistry specialist
🔗 Online booking and consultation
One-Day Teeth Whitening: Frequently Asked Questions
- Is one session of one-day teeth whitening enough?
- It depends on your original shade and the cause of discoloration. Right after treatment teeth can look brighter because of dehydration, so Yeonhap Dental Clinic looks at the shade again with the same shade guide 1–2 weeks later. If you would like it brighter, we check the condition of your teeth and gums and how sensitive they are, then decide whether to add 1–2 more sessions.
- How many days does sensitivity last after teeth whitening?
- It is a temporary reaction, and the Beautis15 approval information states that it goes away within 1–3 days after treatment. It is usually temporary, but if the pain is severe or persists, you should be examined at a dental clinic. Yeonhap Dental Clinic applies a desensitizing agent containing potassium nitrate and fluoride right after the procedure and also prescribes pain medication.
- How long does the effect of one-day teeth whitening last?
- It varies greatly with the cause of discoloration and your coffee, tea, and smoking habits, and at our clinic we usually explain that the shade fades little by little over about a year and a half to two years. There is no set interval for repeat treatment; we recheck your teeth and gums and decide when you would like to do it.
- Can I have my teeth whitened if I have resin or crowns on my front teeth?
- You can, but composite resin and crowns do not lighten the way natural teeth do. If the color difference bothers you after whitening, Yeonhap Dental Clinic discusses replacement once the shade has stabilized, and we also decide the timing of resin bonding together.
- What does Yeonhap Dental Clinic in Gwonseon-gu, Suwon check at a whitening consultation?
- We record your current shade with a shade guide and check your age, pregnancy and breastfeeding status, the cause of discoloration, the condition of your teeth and gums, restorations, and any sensitive areas. If you are not a candidate for the product or treatment is needed first, we tell you before the procedure.
Related pages
Before your visit
This article provides general information on oral health and dental care. Whether treatment is needed, and which method is appropriate, may change after an oral exam and any necessary diagnostic tests. If you have pain, a loose tooth, swelling, or discomfort with a prosthesis, please visit us for a consultation.