This 78-year-old grandfather forgot the most important rule of birthday candle-blowing: Don't spit your teeth into the cake!
Um, that piece is all yours, Grandpa.
But don't feel too bad. You've provided the Internet with a hilarious distraction and you have company in the dentures-into-dessert fail category.
Next year just make sure those choppers are snug in place and we'll forget this ever happened.