A dental disease characterised by moltting of teeth is due to the presence of a certain chemical element in drinking water. Which of the following is that element? 

1. Mercury

2. Chlorine

3. Fluorine

4. Boron

The layer of cells that secret enamel of tooth is: 

1. dentoblast

2. ameloblast

3. osteoblast

4. odontoblast

A baby boy aged two years is admitted to play-school and passes through a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent?

(1) Incisors

(2) Canines

(3) Premolars

(4) Molars

The primary dentition in human differs from permanent dentition in not having one of the

following type of teeth

1. Canine                   

2. Premolars

3. Molars                   

4. Incisors

Which of the folowing teeth are lophodont ?

1. Incisor and canine

2. Canine and premolar

3. Premolar and molar

4. Premolar and incisor