The method

Your face, measured before it is treated.

Every consultation begins with a computer analysis of your face: standardised photographs, 478 landmarks, around thirty measurements in millimetres. Then I decide, with you, with the figures in hand.

landmarks placed on the face
478
landmarks placed on the face
measurements in millimetres
≈ 30
measurements in millimetres
check-up, same measurements
D+15
check-up, same measurements

Why measure.

By eye, you can see that a face is slightly asymmetrical. Measured, you know by how much, and where. That is the whole difference between “a little more volume here” and “two millimetres less on the left than on the right”.

The gesture becomes more precise, and afterwards we can check what has really changed. Without a reference photograph or a measurement, we compare memories.

How it works.

Illustration: the doctor shows the facial analysis on screen
  1. Illustration of the method, no patient data.
    01

    Standardised photographs

    Front, profiles, three-quarters. Same distance, same light, same head position, so that two sessions can be compared.

  2. Illustration of the method, no patient data.
    02

    478 landmarks

    The software automatically places 478 points on the contours of the face, eyes, nose, lips and jaw. I check their position and correct them if needed.

  3. Illustration of the method, no patient data.
    03

    A ruler: the iris

    The diameter of the iris varies very little from one adult to another. It serves as a standard to convert distances on the photograph into millimetres.

  4. Illustration of the method, no patient data.
    04

    Around thirty measurements

    Height of the three thirds of the face, left-right symmetry, width of the cheekbones, contour of the jaw and chin. Every difference is quantified, not estimated.

  5. Illustration of the method, no patient data.
    05

    My interpretation

    The figures decide nothing. I compare them with the clinical examination, with what you ask for and with your expression. Many differences are normal and make your face what it is: we leave them alone.

  6. Illustration of the method, no patient data.
    06

    The two-week check-up

    Same photos, same measurements. We compare. A threshold avoids mistaking a mere change of pose or lighting for a real change.

ZenFace
This is the name of the analysis tool I developed for my practice. It measures and documents; it makes no diagnosis and chooses no treatment. That role remains mine.

Safety.

Before injecting, I overlay onto the facial landmarks the paths of the main vessels described in the medical literature. These are zones of caution, not a guarantee: anatomy varies from one person to another, and the examination, the technique and the dose remain decisive.

Your medical history, your treatments and any contraindications are reviewed at every consultation.

Why your health comes before the procedure, and how I work with your general practitioner: the medical check-up first.

Your photos.

Your photographs are health data. They are analysed on the practice's computer, without being sent to an online service, and become part of your medical record. You can ask for a copy or for their deletion.

Without ambiguity

What the tool does not do

  • It does not make a diagnosis: the doctor does.
  • It does not decide on treatment: I decide after the examination, and I can set a measurement aside.
  • It promises no result: the outcome remains variable.
  • It is not a certified medical device: it is a tool developed for my practice and reserved for my own use.
  • It does not replace the medical record, which remains separate.

Measurement informs. The decision remains clinical, and it is made with you.

The analysis is part of the assessment consultation.

or call 0492 82 82 62

Dr Selim Zengin, general practitioner, University diploma in facial aesthetic medicine and mesotherapy, Université Paris Cité. INAMI number 1-07696-83-003. Written information and a written estimate are given to you before any treatment; with your written consent, the treatment takes place the same day. No result is guaranteed.
Written and reviewed by Dr Selim Zengin, general practitioner, INAMI 1-07696-83-003, university diploma in facial aesthetic medicine and mesotherapy, Université Paris Cité. Last reviewed: 23 September 2026.