Which of the following patients should be referred to orthodontically close a maxillary midline diastema?
1. An 8 year old with no abnormal oral habits.
2. A 14 year old with no abnormal oral habits.
3. A 3 year old with a 4mm overjet.
4. An 8 year old with a previous thumb habit.

(2) and (4)

All of the above.

(1) and (3)

(1) (2) (3)

(4) only