Re: Can an accent be made undetectible? Yes, but they have to start really early. When I studied child language acquisition (many moons ago), I read something about 8 years of age being the cut-off point. On my CELTA course I was told an even earlier age - about 3.5.
But don't let that discourage you. Everyone can improve - it's just that once the phonemes of your L1 have 'hardened' (a bit like the bones of a child's skeleton) it takes more work to UNlearn what you already know about how to make speech sounds.
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