According to the direction of le Collège des médecins du Québec, before-and-after photos constitute testimonies of endorsement, and therefore are in violation of article 2.02.07 of the physician's code of ethics.
2.02.07 A physician may convey factual, exact and verifiable information through any public medium, provided that the information
1° contains no comparative or superlative statement regarding the quality of the products, professionals or services referred
to in the information;
2° contains no expression of support or gratitude concerning that physician or his/her professional practice.