VI. Read the text and answer the questions. How can we keep our teeth healthy? First, w ought to visit our dentist twice a year. He can fill a small holes in your teeth. He can examine our teeth to check that they are growing in the right way. Unfortunately, many people wait until they have toothache before they see a dentist. Secondly, we should brush our teeth with a tooth brush and fluoride toothpaste at least twice a day, once after breakfast and once before we go to bed. We can also use wooden toothpicks to clean between our teeth after a meal. Thirdly we should eat food that is good for our teeth and our body: milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables and fresh fruit. Chocolates, sweet, biscuits and cakes are bad, especially when we eat them between meals. They are harmful because they stick to our teeth and cause decay. 1. Only when do a lot of people visit a dentist? ⟹ ________________________ 2. How often should we try to clean our teeth? ⟹ ________________________ 3. What shouldn't we eat a lot? ⟹ ________________________ 4. Why are sweets harmful? ⟹ ________________________ 5 . How many pieces of advice are there in the passage? ⟹ ________________________ giúp mình với ah