Why should Queen Margrethe colour her hair or bleach her teeth?

She turns 70 next year, so grey or white hair is just natural. As for her teeth - well, it may not look beautiful, but its the teeth of an older woman who smoked a lot. She's not a movie star, she's a Queen.
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Please excuse my english and correct me, if I'm wrong.
There's a lady who's sure all that glitters is gold...