The KöR® Whitening System was developed by renowned cosmetic dentist and teeth whitening pioneer Dr. Rod Kurthy, and is widely regarded as the most effective teeth whitening system known today.

You will wear your KöR whitening trays for a minimum of 14 consecutive nights while you sleep. If you have particularly whitening-resistant teeth, your dentist may advise additional nights of whitening. If you are scheduled for an in-office whitening procedure, continue whitening every night until your whitening procedure.

Your KöR Whitening kit includes syringes of KöR-Night Whitening gel and KöR desensitizer.



  • Store your KöR Whitening Gel syringe(s) in the refrigerator when not in use. Do not freeze. The whitening gel is sensitive to heat. It is imperative NOT to leave your whitening kit with the whitening gel in a hot automobile after leaving your doctor’s office. Place the whitening gel into the refrigerator when you can, and keep the gel away from heat.

  • If irritation (such as redness, swelling, soreness) of the gums or the mouth occurs, discontinue use and consult your dentist.

  • Use for periods of longer than 14 days is to be only under the supervision of a dentist.

  • Avoid swallowing the KöR Whitening Gel and water used for rinsing your mouth after removal of the whitening tray.

  • Use only KöR-Seal Trays to minimize contact of Whitening Gel with gums and/or salivary flow.



  • Pregnant women should not use whitening gels.

  • Products containing peroxides are not recommended for use by children under 12 years of age.

  • Avoid contact of the product with the eye.

  • Keep KöR Whitening out of reach of small children



Start your whitening immediately before sleep. Do not watch television or read with KöR whitening trays in your mouth. Reading or watching TV while whitening may reduce whitening results, due to the increased salivation occurring when you are awake.

  1. Brush your teeth immediately prior to whitening.

  2. Apply KöR desensitizer

    • Wash your hands thoroughly.

    • You will apply KöR desensitizer to each of the four corners of your mouth (upper left, lower left, upper right, and lower right), one corner at a time.

    • The swabs in your kit are to be used only for the application of desensitizer.

    • Apply drops of desensitizer liquid directly onto the cotton tip of the swab until it is fully wet, but not dripping.

    • Set the swab down on a flat surface with the wet cotton tip extending off the edge.

    • Starting with one corner of your mouth, pull the cheek and lip away from your teeth as much as possible by inserting one finger deeply under your cheek and another under your lip.

    • Use your other hand to quickly dry the exposed teeth with a cloth or paper towel.

    • Pick up the swab, and starting on your front teeth, firmly scrub the sides of your teeth with extra emphasis next to the gum line. (You do NOT need to apply desensitizer to your second molars, which are usually the teeth farthest back in your mouth.)

    • Also, rub the swab into the biting edges of your front teeth.

    • Apply desensitizer to another corner of your mouth, following the same procedure of pulling the cheek and lip away from the teeth, and applying the desensitizer.

    • Follow the above steps to apply desensitizer to all four corners of the mouth, and then rinse your mouth gently with water.

  3. Fill KöR whitening trays


Properly filling the whitening trays is critical to achieving maximum whitening results, because it ensures a proper seal of the whitening trays. Dispense a dab of whitening gel into each tooth on the inner side of the outer walls of the KöR whitening trays except in the second molars, which are usually the teeth farthest back in your mouth. Watch the KöR-Night Instructions video found at www.KoRWhitening.com/patient to see the proper tray-filling process.

  1. Seal the KöR whitening trays against your teeth

    • Place the whitening trays over your teeth, and push the trays firmly onto your teeth.

    • The thick gel will push the sides of the tray away from the teeth at the gumline a little. It is very important to gently push the tray back against the teeth until the edges of the tray contact the teeth next to the gumline.

    • You should see just a little excess gel has squeezed out of the edge of the tray as the trays are gently pushed back against the teeth. If you see an excessive amount of gel, the trays have been over-filled. Adjust accordingly the next night. Or if you see no gel has squeezed out – place more gel the following night. This is VERY important to obtaining the best possible whitening result.



  • Upon waking, remove the trays, rinse your mouth and clean your KöR whitening trays with cool tap water using a Q-Tip in a rotating motion as shown on the instructional video. Avoid using warm or hot water, as it could affect the fit of your trays. Do not use the cotton swabs in your kit for cleaning your trays.

  • Shake the excess water off the trays and place them back into the traycase; however, do not close the case if you will again wear your trays that night. Leave the case open so the trays will dry out before the next use.

  • Then brush your teeth, and floss if you normally floss in the morning.

  • After brushing, apply the KöR desensitizer as before.





During the at-home whitening process and a couple of days thereafter, avoid staining foods when you can. Foods to reduce or avoid would be any food or beverage that would badly stain a white shirt.


If possible, do not skip nights when whitening. Consecutive nightly whitening is important in obtaining the very best result.


  • Keep your whitening trays away from heat – heat will distort them. Do not leave them in a hot car. Do not put or wash them in warm or hot water.

  • Keep your whitening trays out of reach of small children and pets. Dogs love to chew on whitening trays.

  • Store your KöR whitening trays safely. Keep them in the case provided. Place your trays loosely in the traycase as shown in the instructional video, and close the case. Improper placement of trays in the case can permanently distort and destroy the trays.


You may expect some slight gum sensitivity from wearing the trays, and your teeth may feel slightly sensitive. If you should feel more than slight sensitivity of the teeth or gums, call your dentist.

You may notice the color of your teeth starts to look uneven. They may develop white spots. The area of the teeth near the gum line may look dark (this is because the rest of the tooth will have become lighter by comparison); or the color may look too opaque (chalky). This is normal and usually evens-out in a week or two after whitening is finished.

You may find that your lower teeth do not lighten as quickly as your upper teeth. Again, this is normal. If there is a noticeable difference between the upper and lower teeth when whitening is completed, your dentist may recommend an additional week of whitening on the lower teeth.


To enjoy a lifetime of white teeth, while still being able to enjoy your favorite foods and beverages, discuss an ongoing maintenance program with your dentist.

You may resume a normal diet, and still, maintain the whiteness of your teeth by wearing your whitening trays at home periodically as your dentist suggests.

If you have any questions or concerns, just give us a call at (415) 986-6900

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450 Sutter St., Suite 1630
San Francisco, CA 94108

(415) 986-6900


Monday: Closed

Tuesday: 8am-5pm

Wednesday: 10am-7pm

Thursday: 9am-6pm

Friday: 8am-5pm 

Saturday: 8am-3pm

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