`21` F ( Dẫn chứng : First, we ought to visit our dentist twice a year. )
`22` F ( Dẫn chứng : Unfortunately, many people wait until they have toothache before they see a dentist. )
`23` T ( Dẫn chứng : Secondly, we should brush our teeth with a toothbrush fluoride toothpaste at least twice a day – once after breakfast and once before we go to bed. )
`24` T ( Dẫn chứng : 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. )
`25` F ( Dẫn chứng : Chocolate, sweets, biscuits and cakes are bad, especially when we eat them between meals. They are harmful because they stick to our teeth and cause decay )
# Nami (≧▽≦)