Any substantial change to the health project, in particular to the operating regulations, a change in the managing body or its legal representative, a change in the geographical location of the centre or its branch or branches where they exist, the closure of a branch, a qualitative or quantitative change to the technical facilities, in particular the installation of one or more additional dental chairs, as well as any change likely to have an impact on the policy pursued by the health centre in terms of the quality and safety of care, is brought to the attention of the Director General of the Regional Health Agency within fifteen days at the latest by any means giving a date certain on receipt.