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5. The number of milk teeth is . a. 4 b. 20 c. 32B. Fill in the blanks.1. The hardest substance in the body is .2. The innermost part of the tooth is .3. The part of the tooth not covered by the gum is .4. The sticky substance that forms on the teeth is .5. A doctor who treats teeth problems is a .C. Label the following.1. Structure of a tooth2. Name the types of teeth.premolars incisors molars canines D. Answer the following questions.1. What are the functions of the teeth?2. Name the parts of the tooth.3. What are the types of teeth?4. Write the difference between incisors and canines.5. How do premolars and molars help us? 6. What are milk teeth and permanent teeth?7. How should you take care of your teeth?8. What is plaque?Arrow-Puffin-4_Semester-1 Science 279