Greetings,

yes, Aligarh Muslim University provides courses in Oral and maxillofacial surgery but they don't provide any diploma courses. They only  provide Master's in dental surgery(MDS) in the specialization of oral and maxillofacial surgery and also they provide clinical training on that same specialization.

you can find more details in their official website in the courses category

www.amu.ac.in (//www.amu.ac.in)

hope this is useful

thank you