How I tell my friend that she should whiten her teeth without embarrassing her?

I have known her for a long time and we got to know each other at work
And she is really good person

I haven't met her for two weeks, and she took a temporary vacation. We met today and I noticed that her teeth were very yellow.


. She works in shipping bags, and I know that her financial circumstances are difficult, but I am ready to pay for the dentist. I feel shy when I talk to her or go out with her.

And one time she fight whit sameone before because he tell her * dentist is calling you*. He was just joking with her but she get really angry
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I find idea. I called this morning and i ask dentist for something like gift card. And he say we can work ont
How I tell my friend that she should whiten her teeth without embarrassing her?
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