Q 01/05
A) 24
B) 28
C) 30
D) 32
Answer · why
That includes the four wisdom teeth, which many people have removed or never grow at all.
Q 02/05
A) 20
B) 24
C) 28
D) 32
Answer · why
They start forming in the embryo at six to eight weeks and begin poking through around six months after birth.
Q 03/05
A) Bone
B) Enamel
C) Cartilage
D) Keratin
Answer · why
It is about 96 percent mineral and rates a 5 on the Mohs hardness scale, about the same as a steel knife blade.
Q 04/05
A) It contains no living cells
B) It is made of pure calcium
C) Saliva dissolves new enamel
D) It only forms before birth
Answer · why
The ameloblast cells that build the layer are destroyed once the tooth erupts, so a cavity is permanent until a dentist fills it.
Q 05/05
A) Eight
B) Ten
C) Twelve
D) Sixteen
Answer · why
The rest of the set is eight incisors, four canines and eight premolars.
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