what does "to its core" mean in this sentence...

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hello everybody, I would be glad if someone tell me what does “to its core” mean in this sentence:

Patients view the medical profession as selfish to its core.

thanks in advance,

Masoomeh

2

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Selfish to its core = fundamentally selfish; selfish by its basic nature
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3

Hi,

This use of ‘core’ is also used in the expression: ‘rotten to the core’ suggesting bad/corrupt through and through -the core being the central part of a fruit such as an apple.

Alan

4

Hi dear Mister Micawber and Alan,
I have got it ,thanks a lot. It exactley matches.

with all best wishes,

Masoomeh