Choose the word that best fits each of the blank spaces.
How can we keep our teeth (13) ______? Firstly, we ought to visit our (14) ____ twice a year. Secondly, we should brush our teeth (15) ____ a toothbrush and fluoride toothpaste at least twice a day, once after breakfast and once before we go to bed. We can also use toothpicks (16) _____between our teeth after a meal. Thirdly, we (17) ______ eat food that is good (18) ______ our teeth and our body: milk, fish, brown bread, raw vegetables, fresh fruit, etc.
(13)......................
Dịch: Làm sao để chúng ta giữ cho răng khỏe mạnh?