Just back from dentist after having a filling replaced and a quick heads up for anybody with a Polish MRE or similar. The "Panzer Cracker" biscuit/hardtack is as tough as claimed! Should come with instructions to soak well overnight then strike repeatedly with a rifle butt before attempting to consume. I was lucky in that the afflicted back molar was already dead beforehand so dodged the whole exposed nerve and spitting blood thing. However it still took two days before a dentist would see me so it got me thinking if I should now include a temporary dental filler in my home medical kit?