Is the hymen intact? Can it be determined by looking at it from the outside?

Patient's question:

Thank you for your reply!
I went for a check-up due to external itching, and the doctor took a sample without asking any questions. Thinking back, it was quite terrifying. I wonder if it was the doctor's negligence.
Can the intactness of the hymen be determined just by looking at it from the outside?
Can one tell if a girl is a virgin just by looking?

Doctor's answer:

Sexual intercourse can indeed cause the hymen to break, but the hymen breaking is not always due to sexual intercourse. Vigorous exercise, vaginal medication, certain heavy physical labor can also lead to the hymen breaking. In childhood, inserting foreign objects into the vagina or masturbation can also cause the hymen to break.