Teeth whitening and smile perception: why teeth matter to a neutral-face rating

Why does a neutral-expression rating care about teeth?

It does not, directly. The scan asks for a closed-mouth, neutral expression, because a smile lifts the cheeks, narrows the eyes and changes the lower third, and the rubric needs the same expression from everyone to be comparable. The photo guide explains why. So there is no teeth trait among the thirty-odd the model returns, and no whitening step can move the score by itself.

Teeth matter for two reasons outside the number. The first is the share card and everything downstream of it: the moment you are seen rather than scored, you are usually smiling, and in a smiling face the teeth are the brightest region and the eye goes to them. The second is that a rating is a means, not an end. The plan exists so that the face reads better to people, and people see you with your mouth open. A page about looksmaxxing that ignored teeth because the camera does would be optimising the wrong thing.

What do teeth signal about health?

The perception literature is careful here, and so should we be. A 2011 review in Philosophical Transactions of the Royal Society B sets out that raters respond to cues of health and condition, with skin among the clearest examples. A 2007 study on female facial skin found that evenness of colour, with shape held constant, changed how healthy, young and attractive a face was judged.

Neither paper is about teeth, and we are not going to pretend it is. What they support is an analogy: viewers read colour and homogeneity as condition, and a smile shows a second surface where colour and evenness are on display. Uneven, stained or greyed teeth are plausibly read the same way uneven skin is, as a cue about health and care. That is a reasoned extension, not a measured finding, and our library holds no rater study on tooth shade and attractiveness. The dental evidence we do hold is about whether whitening works and what it costs, which is the next section.

What does whitening actually change?

Tooth colour has two layers. Surface stains sit on and in the outer enamel and come from coffee, tea, red wine, tobacco and time; polishing and mild abrasives remove some of them, which is what a hygienist's clean and most “whitening” toothpastes do. Intrinsic colour is the shade of the tooth itself, set by the dentine under the enamel, and it yellows and greys with age. Only peroxide-based bleaching reaches it, by diffusing through the enamel and breaking down the coloured compounds inside.

So the honest expectation is this. A hygienist's clean removes surface stain and is the first step regardless. Peroxide bleaching lightens the tooth by a few shades over one to a few weeks, more for yellow teeth than grey ones, and the effect fades over months to a couple of years depending on diet and smoking. Whitening toothpaste keeps a clean tooth clean; it does not bleach.

Dentist-supervised or over-the-counter?

Two practical notes. First, a dentist checks the reason for the colour before bleaching: a grey tooth from an old injury or a filling will not bleach like the ones beside it, and bleaching over untreated decay hurts. Second, sensitivity is common, temporary and dose-related; desensitising toothpaste before and during a course, shorter contact and lower concentration all reduce it, and a professional adjusts these for you where a strip cannot.

What does whitening not do?

It does not change alignment, crowding, gaps, tooth size or the gum line. Those are orthodontics and restorative dentistry, they are a dentist's conversation, and BecomeTen does not recommend procedures at any tier. It does not whiten crowns, veneers or fillings, so a bleached tooth next to an old filling can end up two colours. And it does not fix the thing people most often mean by “my smile”: the shape of the mouth and the lower third, which the rating does read, and which body fat, posture and grooming touch.

It also does not last. Bleached enamel picks up stain like any other, and the people who keep a result are the ones who clean regularly, drink the staining drinks through the day rather than sipping for hours, and do not smoke, which is on the lifestyle page for reasons well beyond teeth.

Where does this sit in a BecomeTen plan?

Nowhere in the score, and near the top of the cheap, real-world list. Because the scan never sees teeth, the report cannot tag a teeth trait, and the plan will not list whitening as a step toward the potential score. Think of it the way the looksmaxxing guide frames grooming: composition that changes how you present, not a trait the model measures. A hygienist visit and a dentist's opinion on bleaching are cheaper than most skincare, and their effect is visible in every photo except the one you send us.