++++ Freedom of movement for persons - Freedom of establishment - Freedom to provide services - Practitioners of dentistry - Recognition of diplomas and qualifications - Directive 78/686/EEC - Scope - Qualification testifying to training acquired in a non-member State - Excluded - Recognition of equivalence of qualification by one of the Member States - No effect (Council Directives 78/686, Art. 7, and 78/687, Art. 1(4))