Prolonged finger-sucking causes an anterior open bite, proclination and protrusion of the maxillary incisors, a lengthening of the upper arch and an anterior displacement of the maxilla. A postnormal or unilateral postnormal molar relationship is often associated with finger-sucking. When the sucking habit terminates, some of the dental effects will correct themselves spontaneously.
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Erik Larsson (1987) studied this question.