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 :
-Pateint
-Payments
-Appoitments
-Diseases
-Diagnose/Treatment
-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 !