Tooth enamel is the hardest surface in the human body(7)

Tooth enamel is the hardest surface in the human body(7)

Tooth enamel is the hardest surface in the human body(7)

The average modern toothbrush has more than 25,000 bristles in 40 groups of tufts

User: Newalbanyimplants Web

Views: 13

Uploaded: 2014-03-25

Duration: 01:04