I don't believe the theory that Alison fell down something high when she lost her fang earlier this year as strongly as I did then.
This morning, I took all four out in the garden. Natasja was in the mood for attacking the others, so I let her in again. Then Alison and Carmen, and Rustan last; The Alison came out of the bedroom and told me she'd lost the upper left fang. No way she'd had time to climb anything, so I'm sure it was Natasja who broke it.
I made a reservation with the veterinary for Monday and left for and airshow at Västerås as it didn't seem worse than last time.