Teeth whitening without enamel...?

So long story short I was bulimic for years and lost quite a bit of enamel around the edges and joins between teeth. I want to whiten my teeth.. But as the enamel is the white part will it not work? I've tried whitening toothpaste and it's made little difference. Would professional whitening or maybe just a stronger whitening kit like the ones with the blue light work or am I wasting my time/money?
Teeth whitening without enamel...?
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