You may experience slight sensitivity and pain for about 2 to 3 days after teeth whitening. It is a good idea to ask the dentist beforehand if fluoride treatment is provided, and since there are ways to adjust the whitening time, if you experience severe sensitivity, please request this in advance for your next re-treatment.

After teeth whitening, it is said that you may temporarily experience tooth sensitivity or increased sensitivity to cold foods, and feel a stinging or irritation if the whitening agent comes into contact with your gums. Usually, these discomforts tend to subside significantly within a few hours to one or two days after the procedure, but I have heard that individual differences exist. If you have sensitive gums, I recommend mentioning this before the procedure and consulting with a doctor regarding the whitening concentration and method.

I heard that after teeth whitening, it is better to avoid dark-colored beverages like coffee for a certain period rather than drinking them immediately. Since the recommended duration may vary depending on the procedure, I think it is safest to follow the schedule advised by your dentist first. If you absolutely must drink coffee, using a straw and rinsing your mouth with water afterward can also be helpful.

While it is difficult to whiten teeth solely through food, pigmented beverages like coffee or tea can cause tooth discoloration, so rinsing your mouth with water afterward can be helpful. In general, it is also important to brush your teeth thoroughly twice a day and receive regular dental checkups and scaling.

I heard that it is done every 6 months to a year. It seems the treatment cycle may vary depending on the degree of tooth discoloration.

While professional whitening can result in noticeable brightening after just a single treatment, home tray or strip methods often use lower concentrations, so changes tend to occur gradually over several days to weeks. The most common side effect of whitening is temporary tooth sensitivity, which usually manifests as a momentary "tingling" sensation when exposed to cold water or wind, and is generally temporary. When using trays or strips, sensitivity may appear on the second or third day of treatment and usually improves within a few days after the treatment ends; however, high-concentration whitening performed at a dental clinic is faster, but the sensitivity may feel more intense.

If you want definite results, the most satisfying method is to first brighten your teeth with 2 to 3 professional whitening sessions at a dental clinic, followed by at-home whitening using custom trays! Your teeth may feel slightly irritated immediately after the procedure, so please avoid coffee or staining foods that cause discoloration. If you use whitening toothpaste for care, your clear tooth tone will last much longer.

I really relate to your concerns about teeth whitening. It varies depending on your individual tooth tone and degree of discoloration, but people usually seem to be most satisfied around the 3rd or 4th session! Since you received the one-day treatment three times, I think your teeth have become beautifully bright enough. Tooth sensitivity naturally disappears after a day or two, and if you get into the habit of using a straw when drinking coffee or tea, your teeth will stay clean for much longer! I hope you get satisfying results.

To manage existing melasma and blemishes, consistently applying sunscreen is essential, and depending on the pigmentation condition, combining it with laser toning or pigment lasers is also a good approach. *Small blemishes with distinct boundaries → You can consider IPL or pigment lasers, usually proceeding 1 to 3 times at intervals of 4 to 8 weeks while monitoring the response. *Wide and faint melasma spread across both cheeks → Consider a method that combines whitening ointments and sunscreen with multiple sessions of relatively mild treatments like laser toning at intervals of 1 to 2 weeks. *Cases where melasma and blemishes are mixed → You can plan to manage the melasma stably while treating only the noticeable blemishes separately. For areas suspected of having melasma, such as the butterfly zone, it is important to assess the skin condition first and adjust the intensity and frequency accordingly, rather than repeatedly using strong lasers.

It is recommended to avoid dark-colored foods and beverages, such as coffee, curry, and kimchi stew, for at least 48 hours after whitening. If you must drink, use a straw and rinse immediately with water. Even afterward, manage your intake by drinking water instead of consuming these foods frequently.

Black tea and green tea also cause tooth discoloration.

Since coffee is a food that causes discoloration... they advised me to avoid it as much as possible after whitening. We don't want the discoloration to go back after whitening, right? ^^ It would be best to refrain from drinking it as much as possible after the treatment~!!