Q 01/05

How many permanent (adult) teeth does a person usually have?

A) 36

B) 24

C) 28

D) 32

Answer · why

D) 32

They split evenly, 16 in the upper jaw and 16 in the lower, and the count includes four wisdom teeth that many people never fully grow.

Q 02/05

How many baby (primary) teeth does a child normally grow?

A) 24

B) 20

C) 16

D) 28

Answer · why

B) 20

Ten sit in the upper jaw and ten in the lower, and there are no premolars in the set at all - the baby molars are later replaced by premolars.

Q 03/05

Which is the hardest substance in the human body?

A) The kneecap

B) The femur

C) Tooth enamel

D) Fingernail keratin

Answer · why

C) Tooth enamel

It rates about 5 on the Mohs scale, between steel and titanium, yet it is as brittle as glass and never regrows once lost.

Q 04/05

What is the soft tissue in the center of a tooth, full of blood vessels and nerves, called?

A) Dentin

B) Cementum

C) Gingiva

D) Pulp

Answer · why

D) Pulp

Patients usually just call it 'the nerve', and it is what a root canal removes.

Q 05/05

Which of the four tissues of a tooth sits between the outer enamel and the inner nerve chamber?

A) Cementum

B) Periodontal ligament

C) Dentin

D) Alveolar bone

Answer · why

C) Dentin

It is yellow-hued and porous, softer than enamel, and it keeps forming slowly throughout life.