Everyone is saying that you get reborn or reincarnated at the summit but it's actually resurrection. The point of him getting to the summit is to revive so he can protect his daughter.
Even if she had all of her teeth pulled it wouldn't add up to 100g. Your teeth probably weigh between 1 and 2 grams each and you only have 32. She would be better off just donating blood to lose the 100g.
I like this manga but the writing is so ham-fisted. Him stealing the staff was a bafflingingly stupid decision and calling it out as a dumb decision doesn't really fix that. It's clear that they mangaka just wanted him to get really powerful, really fast. I hope this doesn't become a battle manga.