It is not the first time that the CJEU has to assess the compliance with EU law of Belgian law and its tendency to absolutely prohibit certain commercial practices. In the Vanderborght case (decided last Thursday, 4 May; case C-339/15), it was the ban on advertising of dental practices that was at stake.
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The CJEU points out that the UCPD allows the Member States to introduce other rules that aim at protecting health and safety of consumer products, as well as codes of conduct related to upholding "high standards of integrity on the part of the professional" (para. 26-27). Therefore, EU consumer law will not stand in the way of imposing a general ban on advertising regulated services, which ban is motivated by concern for public health and safety of products. However, such a general ban on advertising may infringe the freedom of movement of services - art. 56TFEU and provisions of the E-Commerce Directive (2000/31/EC), considering also advertising via websites falls within the scope of this ban.