At what age can teeth whitening be done?

The child is losing their primary teeth and permanent teeth are coming in.

Now all the front teeth have been filled.

The molars and canines are still about half baby teeth...

But the color of the new permanent teeth is very yellow,ㅠ

Are there many cases where it naturally appears yellow?ㅠ

It's so much more fun compared to kindergarten ㅠ

Right now, the front teeth are all shaved down and okay, but when the front tooth first grew back, there was a big color difference, so it looked really unpleasant ㅠ

It seems like I will soon lose all my molars as well...

So, can children also receive whitening treatments?