ugly duckling stage

A stage of dental development in children that precedes the eruption of permanent canines, so called because the lateral incisors may be tipped laterally due to crowding by the unerupted canine crowns
This tipping may cause spacing of the incisor crowns despite crowding of the roots. The condition is often temporary and does not preclude normal dentition. The name is directly borrowed from Hans Christian Andersen’s allegorical fable of the same name

ugly duckling stage,

n a stage of dental development preceding the eruption of the permanent canines, in which the lateral incisors may be tipped laterally because of crowding by the unerupted canine crowns. This tipping may cause spacing of the incisor crowns despite the crowding of the roots. The condition may be transitory in an otherwise normal dentition. It occurs during the mixed dentition stage of the dentition.
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Rebecca says of children: "It's common for them to go through the ugly duckling stage, losing milk teeth while new ones come through.
There were some ugly duckling stages in my life, too," reveals 24 year-old Zoe.