ER Diagram Help needed ! Please ...

Hello ..this is my first post in her (and english is my second language so bare on me please )

i'm having some problems deciding if my ER diagram of a Dental Clinic Information system is correct
let me start of naming the Entitys that i have :
-Prescription (medicine)

i had many many relation connections between them ..really am lost
at the end i came up with a star-shaped er diagram ...pateint in the Center and all other Entitys are connected to it ...
is that correct ? in other words ..HOW can i know if my er diagram is correct ..
help apreciated
thanks in advance !

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