1. We should go to the dentist twice a year. 
2. He examines our teeth and fills the small holes in our teeth before they destroy the teeth.
3. We should brush our teeth twice a day: after breakfast and before going to bed.
4. Foods are good for our teeth are milk, fish, potatoes, red rice, raw vegetables, fresh fruit.
5. Because they stick to our teeth and cause decay. 

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1. Minh went to the dentist yesterday because he had a toothache.
2. The dentist looked at his teeth and told him not to worry.
3. The dentist filled a cavity in his tooth last week. 
4. Most children feel scared when they come to see the dentist.