You child should see a dentist at the age of 6 months to 1 year. When the first milk tooth erupts in the mouth the child should see a dentist. This is an important phase as the doctor suggests on the measures that are to be taken during teething. Also some precautionary points are to be explained as children tend to become cranky during the teething time. It is necessary to ask about oral hygiene, type of tooth paste and dietary restrictions.