KöR or Zoom: Which Whitening Is Right for You?

Zoom is the fast in-office option for everyday staining, done in about 90 minutes. KoR is the deep-stain and low-sensitivity option, worn nightly for about two weeks. Zoom is accelerated by a light in the chair; KoR keeps refrigerated gel sealed against the teeth overnight. Your stain type and sensitivity decide it.

Zoom figures are Zen’s published, all-inclusive prices. KoR is priced per case, so no figure is listed here.

KoR tends to be the gentler path for sensitive teeth. Its gels are refrigerated from manufacture to keep them fresh and mild, desensitizers are built into the protocol, and there is no accelerating light. Zoom manages sensitivity well too, with desensitizers and controlled timing, but KoR is often the first suggestion for tender teeth.

Neither system is harsh when used properly, and both are supervised. The difference is emphasis. KoR was designed around comfort and freshness, so it is a natural fit if past whitening has left your teeth twingy. If sensitivity is your main hesitation, that alone can point the decision toward KoR.

Match the system to the stain. Zoom excels at everyday yellowing and lifestyle stains from coffee, tea, and wine, the discoloration most people have. KoR reaches deep intrinsic stains that sit inside the tooth, including tetracycline and fluorosis, which are the hardest cases and ones many systems cannot touch at all.

Most people fall into the first group, and Zoom lightens them beautifully in a single visit. Deep intrinsic staining is a different problem: the color is built into the dentin, so it needs prolonged, sealed contact with fresh gel to shift. That is precisely what KoR is engineered for, which is why it is the go-to for tetracycline cases once thought impossible to whiten.

Zoom is the fast one: a single in-office visit of about 90 minutes, and you leave noticeably brighter the same day. KoR is a steadier course, worn in sealed trays nightly for about two weeks, sometimes with an optional finishing visit in the chair. Speed favors Zoom; depth and comfort favor KoR.

If you have an event next week, Zoom is the obvious answer. If your goal is the deepest possible change and you do not mind wearing trays overnight for a couple of weeks, KoR rewards the patience. Some cases combine both: a KoR course to reach the deep stain, finished with an in-office boost.

Zoom applies a 25% hydrogen peroxide gel in the chair, accelerated by the WhiteSpeed light across a few short cycles. KoR uses gels kept refrigerated from manufacture until they reach your teeth, held in trays that seal out saliva so the peroxide stays active against the enamel overnight, hour after hour.

The mechanisms explain the trade-offs. Zoom concentrates the work into one supervised session, using the light to speed the reaction while your gums are protected. KoR trades speed for sustained, sealed contact with fresh gel, which is what lets it move stains a single session cannot, and part of why it stays gentle.

Zoom is published and all-inclusive: $800 for the in-office visit, or $550 for a professional take-home course. KoR is priced per case, because each case differs in depth and length, and we go over your price before you come in. Zoom is the standard for most people, and KoR is for the smiles that genuinely need it.

Our model is simple. Zoom is the standard offering that suits most people who want a brighter smile quickly, at a clear published price. KoR is our custom option, reserved for deep intrinsic staining or teeth that need a gentler, longer approach, and it is quoted per case after we have looked at your teeth.

You will never be steered toward the pricier option for no reason. When you book, tell us about your teeth, and our team will point you to the system that fits your stain, your sensitivity, and your timeline.