One Piece: Is Luffy joking when he drinks milk to fill his teeth?

Luffy and Brooke drink milk to instantly cure fractures and teeth, which seems funny, but it makes sense to study it carefully.

There used to be a set of skills called life back. In the past, Luffy showed the ability to digest a lot of food instantly in a big prison, and he also digested cookies with acrylic frame quickly. This is probably because Luffy has gradually mastered the ability of rebirth that originally belonged to CP9, and has also contributed to the improvement of Luffy's strength.

Brooke used to drink milk to treat fractures, which was not beyond the set.