Does IQOS stain your teeth and can I smoke with it after teeth whitening?

Fillings, unfortunately, can't be whitened with the whitening strips you are using. The hydrogen peroxide would be ineffective on them, same as if you had any crowns. Fillings can change color over time with darkened foods and beverages like coffee, tea, red wine, soy sauce, etc. If this is...

If it bothers you aesthetically, you can change it. Also a gray reflection appears. You can indicate that attention should be paid to material selection.

Egg yolks are not known to stain teeth. You should be fine eating eggs. when you have braces, oral hygiene is extremely important, so make sure you are brushing and flossing regularly, and using a water flosser. This will also help you with potential staining.