Where's the tooth fairy

So, last night as I'm on my hands and knees plucking up the day's clumps of cat hair, paper shards and random beads what do I find? A tiny tooth. Must be a cat tooth since all of mine are still intact. At first I thought it must be Amber since she's older and has gum disease. And I managed to peek inside her mouth for verification. No evidence of a recently missing tooth. That leaves Tayoh. Somehow I managed to open her mouth and found that her lower left fang had been replaced by a healed over gum. I felt so terrible that I hadn't noticed any clues and wondered if she was in terrible pain. It looks like the root was left behind. I must phone the vet to see if this warrants a shot of antibiotic. My poor little Tayoh. Not so fierce as she pretends to be...