Meaning of the word "the wolf may lose his teeth, but never his nature" in English

What does "the wolf may lose his teeth, but never his nature" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the wolf may lose his teeth, but never his nature

US /ðə wʊlf meɪ luz hɪz tiθ, bʌt ˈnɛvər hɪz ˈneɪtʃər/
UK /ðə wʊlf meɪ luːz hɪz tiːθ, bʌt ˈnɛvə hɪz ˈneɪtʃə/
"the wolf may lose his teeth, but never his nature" picture

Idiom

a person's character or fundamental nature does not change, even if their appearance or physical abilities do

Example:
He claims to have changed his ways, but the wolf may lose his teeth, but never his nature.
Be careful trusting him again; remember, the wolf may lose his teeth, but never his nature.