'Crowns put on front teeth are often made of porcelain; those put on back teeth, of this precious metal'
gold
LIFE SCIENCE: Crowns put on front teeth are often made of porcelain; those put on back teeth, of this precious metal
Crowns put on front teeth are often made of porcelain; those put on back teeth, of this precious metal
Crowns put on front teeth are often made of porcelain; those put on back teeth, of this precious metal
LIFE SCIENCE
gold
LIFE SCIENCE