The mother of a 4-year-old asks about dental care for her child. "I help brush her teeth every day and her teeth look healthy. When should I take her to see a dentist" Which of the following responses would be most appropriate
A．"Because you help brush her teeth, there's no need to see a dentist right now. "
B．"Ideally she should have seen a dentist already, but it's still not too late. "
C．"Your child doesn't need to see the dentist until she starts school. "
D．"A dental checkup is a good idea even if no problems are noticeable. "