The ugly duckling stage, occurs during the mixed dentition phase (when both milk and permanent teeth are present in the mouth) of tooth eruption between the ages of 7-12 years. It is a stage of dental development that occurs during the eruption of the permanent canine, in which the lateral incisors become tilted because the erupting canines impinge on the roots of the incisors. It is called ugly duckling stage because dentition in children at this stage looks very ugly due to multiple spacing between their teeth. This is a self-correcting condition and requires no treatment or cause for concern. However, check-ups at regular intervals is necessary to rule out the possibility of crowding and if crowding is suspected, growth modification appliances can be prescribed by the dentist.