How long does the effect of Botox last?

You know how sometimes on TV, celebrities say they've gotten Botox?

When I look at it then, it seems firm, but after a while, it quickly returns to its original state.

Botox duration I've heard a lot of people say it's short. Botox duration How long does it usually take?

Would it not even last a month or two?

It seemed to be effective, but the facial expressions looked unnatural, and I heard there were also reports of side effects.

Botox duration I also wondered if it was worth taking that risk if it was too short.

Are there any procedures that are safer than Botox and produce similar effects?