D: What's the matter with you ? 
P: I have a toothache（牙痛）. 
D: Ok .let me see. say "ah". 
P: Ah.....ah …..ah…… 
D: Oh. How often do you brush your teeth? 
P: Once a day. 
D: Do you like eating chocolate or candies? 
P: Yes! I like them very much !
D: Ok. If you want to protect your teeth, please don't eat so much chocolate or candies.
They are not good for your teeth. You should eat more vegetables and fruits , What’s more, you should brush your teeth twice a day or three times a day. If you take my advice, you will be better from now on.
P: Thank you, Doctor ! I'll take your advice.