Teeth Whitening Before and After: One Visit, Two Readings

You have been scrolling other people’s teeth. Two photographs, a caption, and no honest way to tell whether any of that happens in your mouth.

Two photographs decide nothing on their own. The pair of numbers underneath them does. One shade read before the first round, one read after the last.

UpWhiten runs one system, Predictive Whitening™. NanoChroma™ reads the shade you walk in with, in the chair, and writes the number down before any gel is opened. You are buying a shade, not sessions.

A box of strips has no starting number. So its before and after is your own memory of your own teeth, and that is the one witness nobody should trust.

What documented whitening results show

Documented whitening results show a colour change most people can see after one supervised session, and colour that holds for years.

One trial gave 60 adults an in-office session. Over 80% of them had a colour change you can see, in all thirds of the tooth.[1] That is the day’s change, not the year’s.

“I need to see the results or whatever first”

— Ethan P.

That is the right instinct, and it is why the reading comes first. Another team went back to their in-office patients four and a half years later. The colour was still clinically better than the day they started, and it had drifted.[6]

A double-blind trial of 60 adults measured the colour two years on, and it had not slid back.[7] The other arm was a dentist’s tray, and it asked for a fortnight of nights to get there.

The relapse sits somewhere else. In 39 adults across three arms, the two drugstore systems were the arms whose colour came back.[4] The third arm was a tray somebody wore at night for a fortnight.

How the before and after gets measured

A specialist measures your before and after twice on the same instrument, in the chair, on a scale built for whitening.

NanoChroma™ reads on the SS scale. It runs thirty-eight steps, from S40, the most yellow, to S2, the whitest. It is possible to move all thirty-eight, and the step you stop on is your genetic limit.

One course, on the studio’s own records to 12 September 2026, moved twenty-eight steps, from S34 to S6. Those were invoice readings, taken on the same instrument at both ends.

At a dental office your whitening shade is a tab held beside your teeth, and nobody reads it again a week later. That is an opinion. Across six pooled studies, instrument readings beat the eye.[2] What a tab can do, and where it stops, is on how tooth shade is read and recorded.

The tray is what a dentist actually sends you home with, and the quote arrives after a paid exam, per session or per tray. Here the reading comes first, and it is free.

Why a before-and-after photo flatters

A before-and-after photo flatters because two things that change tooth colour in a picture have nothing to do with whitening.

The first is water. Teeth dry out under a lamp and a retractor, and dry teeth read lighter than wet ones.

Thirty people sat with their teeth dehydrated for half an hour. In 85% of the teeth the colour had moved past the point where the shift counts as unacceptable.[3] A day later, 90% of the readings were back under the point where a change shows at all.[3]

The second is the room. Nothing in a photograph records the lighting, the angle, or whether the teeth were dry. The after shot is free to be kinder than the before.

The before-and-afters in a feed are worse again. One laboratory study ran charcoal powder and a violet toner against professional gels. The two social-media methods moved far less colour, and left the enamel with irregularities and granular deposits.[9]

Why results vary from one person to the next

Results vary because three things differ in every mouth. The shade you start at, what the stain is made of, and where your teeth stop responding.

That last one has a name here. Your genetic limit is the shade where the readings stop moving between sessions, because the colour left is dentine rather than stain.

A strip user never finds that line. They keep buying boxes for years, because nothing in the routine ever reports back.

A re-analysis of 300 bleached patients followed the colour for a year. Eleven of them finished darker than they started, and the ones who started lightest were hit hardest.[5]

That is what a reading before you pay is for. The Ideal Shade Package runs unlimited sessions until you reach your ideal shade or your genetic limit, at no extra cost. You hear one number for the whole package at a free Complimentary Shade Consultation, after the reading.

You find out whether your own teeth suit a session at all with a one-minute check before anything is booked.

How long before you see a result

You see the first result the same day, because the second reading is taken at the end of the visit.

One trial put 40 adults through six in-chair sessions and watched the colour settle. On a shade guide, the middle patient’s colour had stopped moving by the second or third session.[8] Measured against the point where a change first shows, no more than a quarter had settled that early.[8]

On the same records, the median client goes from first visit to final reading in about five weeks. Nobody counts sessions towards a limit in that window. Your teeth get as many as they need.

Do you brush your teeth before or after whitening strips

Brush well before whitening strips, but not straight before, so your gums are calm when the strip goes on. After the strip comes off, you can brush gently.

That is the whole answer, and it settles nothing that matters. The question underneath it is whether the strips are doing anything, and a box of strips has no way to tell you.

One trial ran three routes to the same six grades of whitening in 39 volunteers. The strip arm needed nearly thirty-two treatment cycles. The in-chair arm needed just over three.[10]

A box of strips reads nothing. The trial’s researchers read those teeth; the pharmacy shelf never will. A strip habit reloads every few months, so you count it in years.

What a before and after is made of, route by route

The table sets out what the two ends of a before and after are made of, route by route.

Two things never show in a before and after. A crown, a veneer or a bonded front surface keeps the colour it was manufactured in. A stain set deep inside a tooth by an old injury stays put, and the first reading tells you so before you spend anything.

Where this page stops

This page settles what a before and after is made of, and who writes the two numbers down. How long the second number holds before coffee reloads it is on how long whitening colour holds.

The hour that produces those numbers is on what a whitening appointment involves, start to finish. The wider case sits on Teeth Whitening: Methods, Results and Safety, and whitening sessions in the Ottawa studio all begin with the reading.