Has anyone tried teeth whitening?

Among my friends, the dental condition is very serious.

I have a friend, but their teeth are not well-maintained.

Especially because the upper teeth are large, when I smile

Your upper teeth are almost fully visible.

The most important thing is my teeth... they're very dark.

Is it a slightly light gray color?

Because of that, I also pay a lot of attention when I smile.

One day, I covered my face with my hand and smiled.

You said you're stressed out because of your teeth.

They said it was very difficult.

I'm wondering if this is related to teeth whitening.