5Type of TeethIncisors: sharp front teeth that bite and cut food.
6Types of TeethCanines: also called eyeteeth, are pointed teeth that tear food.
7Type of TeethPremolars: flat teeth with double points that tear and crush food.
8Type of TeethMolars: large, flat teeth with several rounded points that grind food into bits.
9Two Main Parts of TeethCrown: the part that you can see above the gum line.Root: the part below the gum line that fits into the jawbone.
10Structure of TeethEnamel: hard, nonliving, dense white material containing calcium. Enamel is the hardest material in your body and helps protect the inner part of the tooth from decay.Dentin: forms the body of the tooth and extends down into the root.Pulp: the soft inner tissue that contains the blood vessels and nerves that lie inside the dentin.
11Common Dental Problems Tooth Decay and Gum DiseasePlaque: a material made up of saliva, food particles and bacteria. The bacteria break down starches and sugars in the food particles, producing an acid that eats into the tooth’s enamel.Calculus: hardened plaque that causes gum disease.Cavity: a hole in the enamel caused by plaque.
12Serious Dental Problems Leukoplakia: White patches on the gums, tongue, lips or inner cheeks, which can lead to cancer.Oral Cancer: an abnormal, uncontrolled growth of cells in the mouth.
13Caring for Your TeethGood dental health begins with a healthy diet that contains enough calcium.Calcium is needed to help build strong teeth, especially the enamel of your teeth.General care: includes brushing after every meal and flossing once a day.Use a fluoride toothpaste. Fluoride is a tasteless, odorless chemical that occurs naturally in soil and water. It makes tooth enamel harder.
14Dental Checkups Vital for preventing tooth and gum disease. You should have regular checkups twice per year.Dentist may take X-rays to find problems that cannot be seen directly.Cavity: decayed place in a tooth.Dentist will remove decayed part and replace it with a filling.
15Lesson 2.2 QuestionsName the four types of teeth and describe the shape and function of each type.How does fluoride help prevent tooth decay?Both brushing and flossing are needed to clean your teeth thoroughly. Why is just brushing not enough?