First: what's staining your teeth?
Tooth staining falls into two categories. Extrinsic stains sit on the surface of enamel and are caused by what you eat, drink, and smoke. Intrinsic stains go deeper — they're inside the tooth structure itself, and they come from things like aging, certain medications, or trauma.
The usual extrinsic suspects: coffee and tea (yes, even your beloved iced coffee), red wine, dark berries, tomato-based sauces, soy sauce, and curry. Basically a lot of delicious things. Tobacco — smoked or chewed — is in a category of its own for staining intensity.
The mechanism is simple: dark pigments called chromogens bind to the protein film that coats your enamel. Acidic foods and drinks make it worse by temporarily softening enamel and making it more porous, so stains set faster. That cold brew you're sipping? Doubly staining.
Intrinsic staining is trickier and can't be addressed with surface whitening alone. That's a conversation worth having at your next visit.
Over-the-counter vs. professional whitening — what's the actual difference?
Whitening strips and toothpastes work on extrinsic staining to varying degrees, and some people do see results. But the concentration of peroxide is much lower than professional-grade treatments, which means slower results, more sensitivity for some people, and less predictable outcomes — especially on stubborn or deeper staining. (Most whitening in toothpaste is actually just an abrasive element. Often, the abrasiveness can be more damaging than brightening strips or gel. The peroxide that may be in the dentifrice won’t sit on the tooth long enough to be effective. It is a great marketing tool, but ultimately not recommended.)
Professional whitening uses higher concentrations of hydrogen peroxide or carbamide peroxide, applied more precisely and often with a custom-fitted tray that ensures even coverage. The results are more uniform, more dramatic, and longer-lasting.
KöR Whitening
We offer KöR Whitening, which is one of the most effective professional whitening systems available. What sets it apart is how it's designed and stored — KöR trays are refrigerated to preserve the potency of the gel to offset the use of chemical preservatives, and they seal closely to the teeth to minimize saliva contamination, which is one of the main factors that degrades whitening effectiveness.
KöR is particularly good for patients with stubborn staining, including tetracycline-stained teeth, which most whitening systems struggle to address. Results tend to be noticeably whiter and more consistent across the whole smile.
It's not a one-size-fits-all treatment — we'd assess whether it's the right fit for you at a consultation. But if you've tried OTC whitening and been underwhelmed, this is worth knowing about.
A few habits that help maintain your results
Whatever whitening route you take, a few simple habits make a real difference: drink dark beverages through a (reusable) straw (I know, I know — but it works), rinse with water after staining foods, and keep up with your professional cleanings, which remove surface buildup before it has a chance to set.
And brush — yes, I'm a dentist and I'm still going to say it — twice a day, two minutes each time. The basics never stop being the basics. Flossing is still a gold standard.
Come talk to us if you've been curious about whitening. Summer is a great time to start. ☀️
See you soon,
Dr. Chan 🦷
