Singing Teeth

When I brush my teeth, they sing.
At first, I thought it was some kind of microchip in the toothbrush, like those expensive greeting cards.
But when I used another toothbrush, they sang just the same.
I asked my dentist about this, and he made sure that the valve on his laughing gas was sealed tightly.
Nobody believes me when I say that my teeth sing. They think I’m crazy.
But I’m not.
What’s worse is that when I forget to brush my teeth, they cry with blood.
“Now do you believe me?” I scream.
They think I’m crazier now.