(b) a person other than a citizen of India. holding a reputable dental qualification and employed for teaching or research in a dental institution situated in any of the States may be permitted 2[ temporary registration in the State register of dentists for the period of his employment or for a period of five years, whichever is shorter: Provided that he does not practise the profession of dentistry for personal gain and his application for registration is approved by the President of the Council.] Scrutiny of applications for registration.