Whitening is the simplest cosmetic step in dentistry — and also the one wrapped in the most marketing fog. Here's the honest version: what actually whitens teeth, which option fits which person, how long results really last, and the sensitivity question nobody's ad mentions.
Why teeth pick up color in the first place
Two different things are happening. Surface stains come from the usual suspects — coffee, tea, red wine, cola, tomato sauce, berries, tobacco — settling into the microscopic texture of enamel. Deeper color is the tooth itself: enamel thins a little with age, letting the naturally yellower layer underneath show through, and genetics deals everyone a different starting shade. Whitening works on both, but knowing which you're fighting sets honest expectations.
Your options, honestly compared
- Professional in-office whitening uses the strongest materials, applied with your gums protected, for the biggest change in the shortest time — the right pick when there's a wedding, a reunion, or you simply want it handled properly in one sitting.
- Custom take-home trays from us are the workhorse: trays molded exactly to your teeth hold professional gel evenly against every surface (and off your gums), whitening gradually over a couple of weeks on your schedule — with the bonus that the trays last for years of touch-ups.
- Drugstore strips genuinely work, just more modestly: milder material, one-size-fits-nobody fit that can miss curved surfaces and the spaces near the gumline, and results that show it. Fine for a small nudge; frustrating if you're expecting a transformation.
- Whitening toothpastes polish surface stains only — helpful for maintenance, incapable of changing the tooth's actual shade. And a friendly caution: the abrasive ones, scrubbed hard, can do enamel more harm than good.
What whitening can't fix — read before you start
This is the paragraph that prevents disappointment. Crowns, veneers, bridges, and fillings do not whiten — their color is baked in — so if you have visible dental work up front, whitening your natural teeth can leave the restoration looking suddenly darker by comparison. (The pro move when new front-tooth work is coming: whiten first, then match the new crown or filling to your brighter shade.) Certain deep discolorations — grayish tones, staining from childhood medications, a single dark tooth after an old injury — also resist bleaching; those are conversations about bonding, veneers, or other approaches, and our veneers vs. bonding vs. whitening guide maps that territory honestly.
How long results last
Whitening is not permanent — anyone who tells you otherwise is selling something. Results typically hold from many months to a couple of years, and where you land in that range is mostly about habits: daily coffee, tea, or red wine and any tobacco pull you toward the short end; good rinsing habits and regular cleanings stretch you toward the long end. The realistic model isn't "once and done" — it's a big initial brightening, then easy periodic touch-ups (this is exactly where custom trays earn their keep).
The sensitivity question, answered straight
Yes, whitening can make teeth temporarily sensitive — a zingy awareness with cold, usually during treatment and for a short while after, fading on its own. It's common and it's manageable: we can pace treatment gently, adjust how long the gel sits, and have you use a sensitivity toothpaste for a couple of weeks before and during. If your teeth are sensitive at baseline, say so up front and we'll build the plan around it — sensitivity is a reason to whiten smart, not a reason you can't whiten. (Already flinching at ice water before any whitening? Start with our sensitive-teeth guide — there may be something fixable underneath.)
Keeping them white
Rinse or sip water after coffee and wine, use a straw for the iced stuff, don't smoke (the list of reasons grows again), and keep your regular cleanings — polished teeth stain slower, and a professional cleaning alone often brightens more than people expect. Touch up with your trays when the mirror says so.
Start with the honest twenty-minute conversation
The right whitening plan depends on your starting shade, your dental work, your sensitivity, and your calendar — a quick look and we'll tell you exactly what's realistic for your smile, with zero pressure toward more than you want. Come see us at our Keene office or our Joshua office.