Hard pice of something in pizza

I know all about running a resterant and things that can go bad. I ordered a pizza on Saturday night around 19:52pm online order.. it was delivered a little late witch I understood... but the pizza had been squashed a bit and so I asked they remake it. Witch was done.... and delivered 46 min later.. I was still understanding and had no issue with the pizza. I ate 3 slices no problem and on the 4th pice I almost broke a tooth on something very hard ... I will attach picks ... this is not good at all. I would like to get feed back regarding .