Teeth Stains: Two Kinds, and Only One Comes Off by Brushing

Teeth stains come in two kinds, and your brush reaches one of them. One is a film on the outside of the tooth. The other is the colour of the dentine underneath, and nothing in a tube reads it. A meta-analysis pooled 1,322 people, and the whole whitening-toothpaste category topped out under two shade tabs more than ordinary toothpaste.[3]

You have been looking at the same tooth in the same bathroom light for weeks, working out whether it is the coffee. A mirror cannot tell you which of the two you have.

Predictive Whitening™ begins by settling that. Before any gel is opened, NanoChroma™ reads your starting shade on an instrument in the chair, not off a chart held to your face.

Against that reading the specialist sets your target shade and the number of rounds, and reads the same colour once more at the end. You are buying a shade, not sessions.

What kinds of tooth stain are there

Tooth stain comes in two kinds, and age deepens both. Extrinsic stain sits on the surface of the tooth, and intrinsic stain is the colour inside it.

Extrinsic stain is the film that coffee, tea, red wine and tobacco leave on enamel. A brush, floss and a hygienist’s polish all reach it, and the polish comes with the next appointment and the next bill.

Intrinsic stain is the tooth’s own colour, and some of it came from medicine you were given. One review of drug effects on teeth names fluoride and tetracyclines behind the intrinsic kind.[8] The same review puts chlorhexidine, iron salts and stannous fluoride behind the surface kind.[8]

Age works on both at once, as enamel thins, dentine darkens, and years of coffee sit on top.

A reading settles which of the two you have, and the Complimentary Shade Consultation ends with one.

How surface stains and internal stains differ

Surface stains and internal stains differ by depth, and depth decides what can touch them. Abrasion cleans a surface. Changing the colour underneath it takes a professional treatment.

One laboratory test ran whitening toothpastes carrying up to five percent hydrogen peroxide against a professional tray gel.[5] The toothpastes drove more of it into the pulp chamber, and whitened less.[5]

The ceiling for the whole category is low. Pooled across 1,322 people, whitening toothpaste shifted colour by under two shade tabs, and carried a 74% higher risk of an adverse effect.[3] A trial put 161 people across seven whitening toothpastes and a plain one, and found the effect arrived early and did not last.[4]

Charcoal ends up in the same place. A randomised trial put activated charcoal powder and charcoal toothpaste against ordinary fluoride toothpaste, and all three landed together.[6] The authors wrote that charcoal products should be discouraged.[6]

The table below puts four routes beside each other, and only one of them reads your shade.

Some colour never answers to whitening. Anything man-made in your smile line, a crown or a veneer or a bonded front, holds the colour it was manufactured in. A tooth darkened from the inside after an old knock does not answer to a surface treatment. Your first reading names all of that before you pay.

How to get stains off teeth

Getting stains off teeth is two different jobs, and only one of them is brushing. Cleaning lifts the film. Moving the colour underneath takes a professional treatment, in timed rounds, read before and after.

One trial counted the treatments each route needed to reach the same six grades of whitening. Drugstore strips took nearly thirty-two cycles. The in-office arm took just over three.[1]

A supervised treatment moves colour you can see. A randomised trial ran 60 adults through an in-office protocol.[2] More than eight in ten showed a perceptible colour change right after the visit, in every third of the tooth.[2]

Retail products hand the colour back. A randomised trial of 39 adults ran two over-the-counter systems against a professional tray gel, and only the retail arms relapsed in colour.[7] So you pay again every few months, for years, and nothing ever tells you when to stop.

At UpWhiten you buy the Ideal Shade Package, which is unlimited sessions until you reach your ideal shade or your genetic limit, at no extra cost.

Predictive Whitening™ is why we can promise that. We never spend a session on a tooth that has stopped moving, because NanoChroma™ reads before and after every one.

The NanoChroma™ scale runs thirty-eight steps, S40 at the yellow end and S2 at the white end. All thirty-eight can move, and the step where yours stop moving is your genetic limit. One course on the studio’s own records to 12 September 2026 moved twenty-eight steps, from S34 to S6.

We take every reading in the chair, and what a session in the Ottawa studio involves starts with one.

Can chocolate and herbal tea stain teeth

Chocolate and herbal tea both stain teeth, and for the same reason. Chocolate carries dark pigment and sugar. Herbal teas carry tannins, and some carry acid, which roughens enamel so pigment grips harder.

“I was heavy on coffee.” — Salem A.

The list runs longer than people expect. Coffee, tea, red wine, cola, curry, beetroot, soy sauce and tobacco all leave the same kind of film. None of it means damage. A cleaning lifts that film, and a professional treatment goes under it.

Which signs call for a dental assessment

Some marks are not stain at all, and those call for a dental assessment. A brown or black spot that catches a fingernail can be decay. A chalky white patch can be enamel that has lost mineral. One tooth darker than its neighbours points at a nerve that died years ago.

Whitening does not treat any of those three. It changes the colour of natural tooth, and nothing else.

Nobody settles this by eye, either. A tab is somebody’s opinion in that day’s light. One meta-analysis pooled both ways of reading shade, and put the instrument ahead of the eye.[9] NanoChroma™ returns a number instead.

A dentist whitens teeth between fillings, and you pay for the exam before anyone quotes you. At UpWhiten whitening is the only line, and 1,000+ customers came here for whitening and nothing else. Here the reading comes before the number.

Where each stain type is covered in full

This page stops at telling the kinds apart. The yellow that creeps in with age and coffee is argued out on why teeth turn yellow. What actually shifts it is on removing yellow from teeth.

Brown and black marks need decay ruled out before anything else, and that case is on brown and black marks on teeth. Whitening makes chalky white patches louder before it makes them quieter, and white patches on enamel takes it from there.