What happens when you eat boiled goose after you've had your teeth whitened?

Yes: The things that stained your teeth will continue to stain your teeth after you lightened them. This includes coffee , tea, dark grape juice, red wines, blueberries, and other dark pigmented food. As for boiled goose, this this should not be an issue. But many people do need to touch up their teeth to maintain the shade they like. This is common thing to do. Your dentist can answer questions.

It should be fine: Avoid anything that would stain your white t-shirt, like red sauce, red wine etc. I think boiled goose would be fine, even though I have never heard of boiled goose.