Do guinea pig's loose their teeth?

no they shouldn't lose there teeth they have one set of teeth and that's it. they grow for ever that's why you should have a chew toy in the hutch or a peice of wood so that they can keep their teeth to a healthy length. my guinea pig lost her top teeth so i had to MASH her food and hand feed her it took a couple of days for her teeth to grow back but make sure to check that there is a bit of their teeth there where the gum is because if it is just gum you may need to take him for an xray to see if the teeth are going to grow again.

hope this helps