What a Trial Smile Is Actually For

Patients usually describe the trial smile as "seeing what it will look like". That is the smallest part of what it does.

A design on a screen is a still image of a face at rest. A smile is not. It is a moving thing that happens at different intensities — a polite one across a table, a real one at something genuinely funny — and the amount of tooth and gum that shows changes enormously between them.

Why a rendering is not enough

We film patients talking and laughing before we design anything, precisely because the still photograph lies. Two people with identical tooth proportions can need completely different incisal edge lengths depending on how their upper lip moves.

But even video has a limit. What it cannot tell us is how the new length feels against the lower lip when you say a word with an F in it, or whether a particular edge shape catches when you bite a sandwich. Those things are only discoverable by wearing it.

What the week is for

The approved design is printed and bonded temporarily over unprepared teeth. Nothing has been cut. You go home with the new smile and live in it for seven days.

The most useful feedback almost never arrives in the clinic. It arrives after a family dinner, or after someone who would be honest has failed to notice anything.

We ask patients to photograph themselves in daylight, to eat normally, and — most importantly — to show people who will tell them the truth. The revisions that come back from that week are specific: slightly shorter centrals, more character in the lateral edges, a canine that reads too pointed.

The part nobody expects

Occasionally a patient wears the trial smile and decides they do not want it at all. They liked their own teeth more than they realised, or the change they thought they wanted turns out to be someone else's idea of what they should look like.

That outcome is a success. It cost a week and a printed mock-up, and it prevented an irreversible treatment that would have been regretted. The alternative — finding out after ten teeth have been prepared — has no good ending.

How it changes the preparation

There is a technical benefit too. Because the final shape is agreed in advance, the preparation can be done through the approved design rather than to an arbitrary depth. We cut through a silicone index of the trial smile, which means we remove only the enamel that the actual design requires.

In practice, that is the difference between a typical preparation of 0.4mm and one of 1.2mm. Over ten teeth, it is a great deal of your own tooth still in your mouth.