Curious about teeth whitening

I looked up teeth whitening, and it turns out it's done with medication.

We also use bleach to make our clothes white.

But if you frequently wash with bleach, the fabric will deteriorate.

It feels like even the surface of the tooth is somehow being worn down or something.

It feels like the density will become weaker.

Teeth whitening ingredients are obviously harmless to the human body.

I'm worried about whether there might be other side effects, just like the concern above.

Since nothing is permanent, I am worried because it seems like it needs to be done periodically.