I've seen REAL lion's teeth, up unexpectedly close as well!
I was out running out in the Pennines (Lancs/W. Yorks border) near to my home and was ascending an off-road track heading up to a ridge where the last farm (first if you were going the other way) of that region is positioned when I heard a low growling which worried me immediately. The mist was down so I didn't see it properly until I was right on top of it but there was a proper, full-grown male lion!
Of course, I told all my running pals of the time who dismissed my ridiculous story as fabricated nonsense. Until about a month later when I delighted in reading them out a story in our local newspaper which stated the owner of the very farm I'd ran on to - well I had to, the public right of way crossed it - had been prosecuted for keeping a dangerous animal, contrary to the wild animals act or some such, namely a lion in a cage, on his property.