BEIJING - Towering 8 feet 4 inches tall, a tower of diseased
human teeth stands as a gruesome testament to one man's
dedication to dental hygiene.

Yu Qian, 52, a dentist for 32
years, collected the 28,000 teeth used in the tower from
patients' mouths.

He started building the tower in 1993 with
his six students to raise awareness about dental hygiene.