51 Boxes of Toothpaste

"I'm calling to deny Mr. Smith's request for refills," the dentist explained. "There's NO WAY that I would ok this refill!"

"Ok, we'll let him know," I said.

"WHY on EARTH he would need 51 boxes of Prevident anyway?" 

What?

Yes, ladies and gentlemen, the dentist saw "Quantity: 51" on the refill request and thought that meant number of tubes, not the 51 grams in ONE tube, as it comes."