One day, I had a bad toothache. I couldn't eat anything. So I went to see the dentist. " What's wrong with your teeth? " asked the dentist. " I have a toothache. " I told him. " Let me see your teeth ...... Um, there's a hole in one of the teeth. Do you eat a lot of sweet food? " The dentist asked me. " Yes, I do. I often eat ice cream, biscuits, chocolate and I often drink cola and milk with sugar, " I told him. " All these are bad for your teeth. You must eat less sweet food and brush your teeth at least twice every day. Now let me fill your bad tooth. " Eating less sweet food  _  .
isn't good for our teeth is only good for children's teeth is good for our teeth is bad for our teeth