Page 279 - Demo

Let%u2019s Recall%u00be You have two sets of teeth - the milk teeth and the permanent teeth.%u00be The milk teeth start falling off when you are five or six years and you have a full set of permanent teeth by the age of 12 or 13 years.%u00be A tooth has many parts - the crown, the enamel, the dentin, the pulp and the root.%u00be There are four types of teeth - incisors, canines, premolars and molars.%u00be You must take care of your teeth to keep them strong and healthy.Let%u2019s Revise Conceptual UnderstandingA. Choose the right answer.1. The teeth used to tear pieces of food . a. canines b. incisors c. molars2. The part below the enamel of the tooth is called . a. pulp b. dentin c. gum3. The number of incisors is . a. 4 b. 8 c. 24. The teeth formed between ages 17 and 21are called . a. permanent teeth b. wisdom teeth c. milk teethmilk teeth : the first set of teethpermanent teeth : the permanent set of teethcrown : the part of the tooth projecting from the gumenamel : the substance that covers the crowndentin : the part beneath the enamelpulp : the innermost part of the toothroot : the part of the tooth under the gumincisors : the front teeth that help you cut, chop and slice foodcanines : the teeth next to incisors that help you tear foodpremolars and molars : the flat teeth that help you chew and grind foodplaque : the sticky substance that is formed on teethdentist : a doctor who treats teeth problemsKey Terms278 Arrow-Puffin-4_Semester-1 Science