Hi lou_tally. Hope your pup is well :)
When I got my Collie, teething was the last thing I had considered, and actually we only found a little blood on one of his toys, and a couple of teeth on the floor! As kita1 says, they often get swallowed up with puppy's food.
Jack liked rawhide chews out of the freezer-like a baby's soother, it helps for them to have something to suck/chew on.
As kita1 also mentioned, it's nice to have one as a keepsake too if you can find any more!
Teething is quite a short process for dogs normally I think-we blinked and pretty much missed Jack's!
Lisa x