(8th time) I want my teeth to be white

I'm so jealous of the white teeth when celebrities smile.

I met my older sister today, and she teased me that my teeth are yellow.ㅡㅡ;;;

I've known all along that my teeth weren't white, but hearing it so directly really upset me.

I guess I've just been living carelessly all this time;;

My sister is doing her own whitening treatment at home.

Maybe I was more concerned about my yellow teeth.

Are you satisfied with the results of doing teeth whitening at home yourself? Surely, having it done at the dentist's office would be more effective, right?

Actually, I'm most worried about the cost.