This is a question about teeth grinding and tooth damage.

I heard from my family that I grind my teeth while sleeping, and indeed, there are times when my jaw feels stiff in the morning.
I am wondering if teeth grinding causes tooth wear or cracks.
I have heard that mouthpieces or Botox treatments are helpful, and I would like to know the difference in effectiveness.
I am also wondering if improvement is possible even if the teeth are already worn down.
I would like to know what problems can arise if teeth grinding is left untreated.
I am also wondering if teeth grinding during sleep can be completely cured.