You want your teeth a bit whiter. Not glow-in-the-dark white, just brighter, the way they looked a few years ago, maybe in time for a wedding or a round of photos. Then you find out there are two professional options at our practice: KöR whitening in the office, and Opalescence Go to use at home. One costs a lot more than the other, and you're not sure what the extra money buys or which one your teeth actually need.

The short answer

Choose KöR whitening if you want the biggest change in a single visit, have a date on the calendar, or have stains that home products haven't touched. It's $715 for one in-office visit of about 90 minutes. Choose Opalescence Go if you want a gentler, gradual lift, have a small budget, or mostly want to freshen a smile that's already in good shape. It's $150 and you use it at home. Either way, whitening only changes natural teeth, so I check your gums and any old fillings or crowns before you start.

KöR vs. Opalescence Go, side by side

Here's how the two compare on the things people ask me about most:

• Where it happens: KöR is done in our office. Opalescence Go is done at home, on your own schedule.
• Time: KöR takes one visit of about 90 minutes. Opalescence Go works gradually over a series of days.
• Cost: KöR is $715. Opalescence Go is $150.
• Strength: KöR uses a more concentrated gel, applied by us with your gums protected. Opalescence Go uses a milder gel in prefilled trays.
• Best for: KöR suits a deadline, deeper staining or the biggest change. Opalescence Go suits a gentle lift, a tight budget or a touch-up.
• What neither one changes: crowns, veneers, fillings and bonding keep their color with both.

That last line matters more than people expect, so I'll come back to it.

KöR whitening: one visit, the biggest change

KöR is our in-office teeth whitening. You spend about 90 minutes in the chair. Before the gel goes on, we cover your gums with a protective gel or shield, then apply a whitening gel that's more concentrated than anything sold for home use. Because we control the whole process, we can use that strength safely and watch how your teeth respond.

That's what the extra cost buys: a stronger gel, applied and monitored by us, in one sitting. If your wedding is soon, or you've tried whitening strips and given up, KöR is usually the more satisfying choice.

Who it's right for, in plain terms:

• You have a date. A wedding, a reunion, headshots.
• Home products haven't worked. Years of coffee or tea have left stains that strips didn't budge.
• You'd rather be done. You don't want to remember trays every day.

Opalescence Go: gradual whitening at home

Opalescence Go is take-home whitening that comes from our office, not a drugstore shelf. The gel comes in prefilled trays that you wear at home. The gel is milder than in-office whitening, so the change builds over days instead of hours. Home whitening from a dentist is worn daily over a stretch of days to a few weeks, and that slower pace is the point. You see your teeth lighten a little at a time and can stop when you like the color.

Who it's right for:

• You want a subtle change. Brighter, but nobody should notice anything except that you look well rested.
• Your teeth are already in good shape and just a little dull.
• You're watching your budget. At $150, it's the easier place to start.
• You've whitened before and want a touch-up rather than starting over.

Three things that decide it

When someone asks me which whitening to pick, I look at three things before I answer.

1. What's already on your front teeth. Whitening will not work on crowns, veneers or fillings. Only natural teeth lighten. If you have a tooth-colored filling or bonding on a front tooth, it stays the same color while the teeth around it get whiter, and suddenly it stands out. That doesn't mean you can't whiten. It means we plan the order: whiten first, then match any bonding or crown to your new tooth color.

2. Your gums and your enamel. Whitening gel on sore, bleeding gums stings, and bleeding gums are never "just gums." They're a sign of inflammation that's linked to heart disease and diabetes, so I want them healthy before we whiten anything. I also look for cavities, worn spots and areas where gums have pulled back and left the root showing. Those spots are more likely to feel sensitive, and that can shift me toward the gentler, gradual option.

3. How white is right for your face. This is the part people worry about most. Nobody wants teeth that look painted on. I use smile preview software to show you a preview of your potential new smile on screen before anything is done, so we can talk about a tooth color that suits your skin and the whites of your eyes. The goal is the brightest color that still looks like your own teeth.

What I usually recommend, and when whitening isn't the answer

For a bride with a date six weeks out and healthy teeth, I usually suggest KöR. One visit, a clear result, and time to spare before the photos. For someone who wants a small lift and would rather go slowly, Opalescence Go is a smart, affordable place to start, and you can always step up later.

There's an honest limit, too. If your front teeth are yellow because the enamel has worn thin, or because old crowns and fillings don't match, whitening alone won't give you the result you're picturing. In that case, we'd talk about whether porcelain veneers or new bonding make more sense, and I'd rather tell you that before you spend money on whitening that can't fix the real problem. If that sounds familiar, I explain more in why teeth stay yellow even after whitening.

A little sensitivity during or right after whitening is common with both options, and it usually fades within days. If your teeth are already sensitive, tell me. It changes which option I suggest and how we go about it.

Paying for whitening

KöR whitening is $715, and Opalescence Go is $150. HSA and FSA cards are accepted, along with all major debit and credit cards, and you can split larger treatment plans into monthly payments through Cherry. If you don't have dental insurance, the Smile Wellness Membership includes preventive wellness visits each year and 10% off other treatment, with some exclusions.

Find the whitening that still looks like you

A brighter smile should look like your smile on a good day, not like someone else's teeth. Whichever option fits, I'll make sure your gums are healthy, your old dental work won't stand out, and the tooth color suits your face.

Want a first look from home? Try the free virtual consult: upload a photo of your smile, see a preview of what a makeover could look like, and I'll send you a personalized video with your plan. Or book a consultation, which is free, or call (214) 295-9270. I'm Darya Timin, DDS, FAGD, and I'll help you pick the whitening that gets you there.