In the last few years, the interest of dentists in aesthetic treatments has grown considerably. For this reason, many European Union Country (E.U. Countries) have regulated the competences of dentists in the field of aesthetic medicine. One of the most common therapies in this field is represented by the injection of botulinum toxin type A (BTX-A). This study has analyzed the regulatory measures on the BTX-A administration adopted by all the E.U. member States. The search found the presence of a very varied regulatory framework and the need for convergence measures between legislations. In fact, the harmonization of dental competences is one of the pillars of the freedom to provide services under Directive 2005/36/EC. The prevision of common competences is functional not only to allow the professionals movement among the E.U. Member States, but also to guarantee the health of patients and avoid market distortions.