FalimSugarless Plain Gum with Carbonat and mint aromatic, 20 Pack, 100 Pieces Each by Falim

Bought this to exercise my jaw. It is definitely chewy. Sadly, it's really unpleasant.

As far as I know falim gum is the toughest gum out there so if that's what you're looking for you can't go wrong with it. I've bought from this seller a few times now and the gum has always arrived within a couple of days.