Teeth whitening~

They say that once you take off your mask, you will put on makeup on your face again.

There's nothing you can do about your teeth turning yellow.

But I think yellow teeth make the expression look duller.

I'm also concerned about laughing wholeheartedly...

Can teeth whitening be done regardless of gum sensitivity or the condition of the teeth?

How many times do I need to receive it?

Is it something you need to get regularly once you've had it, like skin? I have so many questions, haha.