I heard that once you whiten your teeth, proper care is quite important.

Lately, I've been a little self-conscious about the color of my teeth when I smile.
I am looking into dental teeth whitening.

I tend to drink coffee often, so
I was worried that the discoloration might return quickly even after whitening.

But I don't have the confidence to quit coffee completely.

Should I be more careful with food or drinks than usual after whitening?
I'm also curious to know how long it lasted for those who have actually received it.