A brighter smile is one of the simplest, most conservative cosmetic changes we offer at Kentfield Dental. Dr. Soroush Ghaffarpour ("Dr. G") — who continues the 47-year legacy of founding dentist Dr. John Herschleb here in Kentfield — takes an aesthetics-first, comfort-focused approach to whitening, pairing professional-strength treatment with a careful eye for natural-looking results and managed sensitivity. Whether you're a Marin patient prepping for a wedding, a reunion, or simply tired of coffee and red-wine stains, we'll help you choose the whitening path that fits your smile and your schedule.
What is professional teeth whitening?
Professional teeth whitening uses dentist-grade bleaching gel — typically hydrogen peroxide or carbamide peroxide — to lift years of staining from coffee, tea, red wine, dark foods, tobacco, and ordinary aging. The gel breaks down the pigment molecules trapped in your enamel and the dentin beneath it, so your natural tooth shade can look noticeably brighter without changing the structure of the tooth. It's one of the least invasive ways to refresh a smile, since nothing is drilled away or permanently altered.
There are two professional routes, and many patients combine them. In-office whitening is done in a single appointment in our Kentfield office, where a higher concentration of gel is applied under controlled, supervised conditions for the fastest visible change. Custom take-home whitening uses trays we make from a precise digital scan of your teeth, so the gel stays where it belongs and reaches every surface evenly. Because both are dispensed and monitored by a dentist, they're designed to be stronger and more even than over-the-counter strips or one-size-fits-all kits — and gentler on your gums than ill-fitting products used without supervision.
How we whiten teeth at Kentfield Dental
Whitening at Kentfield Dental starts with a quick exam, not a generic kit. Dr. G checks that your teeth and gums are healthy, identifies what's actually causing the discoloration, and sets honest expectations about what whitening can and can't change — because deep internal stains, existing crowns, veneers, and tooth-colored fillings don't lighten the way natural enamel does. From there we map a plan that suits your goals, whether that's a single in-office session before an event or a custom take-home system you control at your own pace.
Our custom take-home trays are made from a 3Shape digital intraoral scan — no goopy molds — so they fit snugly and help keep gel off your gums. When a same-day timeline matters, our in-house Formlabs 3D printing means we can often produce a precise, well-sealed tray on-site rather than sending impressions to an outside lab and waiting a week or two. It's part of our "things most offices don't do, we do" approach: more of the process happens under one roof in Kentfield, with results designed to look natural rather than artificially chalky.
- In-office professional whitening in a single visit, supervised by Dr. G for even, carefully managed results
- Custom take-home trays made from a 3Shape digital scan — no traditional molds or impressions
- Formlabs in-house 3D printing means custom trays can often be made on-site, frequently same day
- MouthWatch intraoral cameras let you see your starting shade and existing dental work before we begin
- Honest shade planning so whitening can blend naturally with any future veneers, crowns, or bonding
Why patients choose us for this
Stronger, faster results
Dentist-grade gel is designed to lift staining more effectively than drugstore strips or kits, so many patients see a brighter, more noticeable change in less time.
More even, natural color
Custom trays made from a digital scan hold gel against every tooth surface, helping avoid the patchy, streaky look that over-the-counter products often leave behind.
Gentler on gums and enamel
Because treatment is supervised by Dr. G and the trays are precisely fitted, gel stays off your gums — which can reduce the irritation common with ill-fitting kits used unsupervised.
Managed sensitivity
We tailor gel strength and wear time to your comfort and can add desensitizing steps, so sensitive teeth aren't a reason to skip whitening altogether.
Conservative by nature
Whitening brightens your existing enamel without drilling or removing tooth structure, making it one of the gentlest cosmetic options we offer in Kentfield.
Built around your goals
From a single pre-event in-office session to a take-home system you control at home, we match the approach to your timeline and the smile you're after.
What to expect
Exam and shade assessment
We start with a quick check of your teeth and gums and identify what's causing the staining. Using our MouthWatch intraoral camera, we show you your starting shade and any existing dental work that won't whiten, so there are no surprises.
Choosing your whitening plan
Dr. G recommends in-office whitening, custom take-home trays, or a combination based on your timeline, sensitivity, and goals — and sets honest expectations about the results you can expect.
In-office whitening or tray fabrication
For in-office treatment, professional-strength gel is applied under supervision in a single visit. For take-home, we capture a 3Shape digital scan and craft custom trays, often produced same day on our in-house Formlabs 3D printer.
At-home whitening (if applicable)
If you're using trays, we walk you through exactly how much gel to use and how long to wear them, then have you whiten gradually at home over a series of days for an even result you control.
Comfort check and follow-up
We address any sensitivity, review how to protect your new shade, and offer simple touch-up guidance to help your results last as long as possible between appointments.
Your comfort matters. Sensitivity is the most common reason people avoid whitening, so we tailor gel strength and wear time to your comfort and can add desensitizing steps. Dr. G's calm, comfort-focused approach is reassuring for anxious and sensitive patients alike.
Is professional whitening right for you?
Whitening tends to work best on healthy teeth with the kind of yellowish or brownish staining that builds up from food, drinks, tobacco, and age. During your visit, Dr. G will look at the cause of your discoloration and let you know how much change is realistic — grayish stains, stains from certain medications, and discoloration inside the tooth respond less predictably, and existing crowns, veneers, and tooth-colored fillings won't lighten at all. If whitening alone won't get you where you want to be, we'll talk through conservative options like bonding or veneers. Results vary from person to person, and we'll always set expectations honestly before we start.
- Your teeth have dulled or yellowed from coffee, tea, red wine, dark foods, or aging
- Over-the-counter strips or kits left you with uneven results or didn't go far enough
- You want a faster, more controlled brightening with a dentist supervising the process
- You're preparing for a wedding, reunion, headshots, or another event in Marin
- You've had sensitivity from store-bought whitening and want a gentler, managed approach
Frequently asked questions
In-office whitening is typically completed in a single visit, often about an hour. Custom take-home trays usually brighten teeth over a week or two of short daily sessions, depending on the gel strength and how much change you're after.
Professional whitening is stronger, more even, and supervised by a dentist. Dentist-grade gel and custom-fitted trays reach every tooth surface and help keep gel off your gums, which can avoid the patchy results and irritation common with one-size-fits-all drugstore kits.
Some patients notice temporary sensitivity that usually fades within a day or two. At Kentfield Dental we manage this by tailoring the gel strength and wear time and can add desensitizing steps, so sensitive teeth don't have to keep you from whitening.
Results vary and depend largely on your habits. Coffee, tea, red wine, and tobacco gradually reintroduce staining, so many patients keep their custom trays for occasional touch-ups to maintain their shade over time.
No — whitening only lightens natural tooth enamel. Crowns, veneers, and tooth-colored fillings keep their original color, so if you have existing dental work in your smile, Dr. G will help plan your shade so everything blends naturally.
Often, yes. We offer in-office professional whitening in a single appointment at our Kentfield office, and thanks to our in-house Formlabs 3D printing, custom take-home trays can frequently be made same day rather than waiting on an outside lab.
When supervised by a dentist, professional whitening is considered safe for most healthy teeth and gums. Because Dr. G evaluates your mouth first and the trays are custom-fitted, treatment can be gentler than unsupervised store-bought kits.