Tongue thrust has been taken as one of the possibly etiologic factors in malocclusion since early 1960s. There is still controversy if tongue thrust strengthens the causes of anterior open-bite. However, there is a tongue thrust swallow to form an anterior seal in the patient with an anterior open-bite. Anterior tongue placement has been considered to be the result of anterior bite instead of the cause of the anterior open-bite in modern literature. A 9-year-old boy inserted with a tongue crib to block his deleterious anterior tongue thrust habit was reported. After 50 days, anterior open-bite malocclusion had been corrected and the result had being stable more than two years since the appliance was removed. This case report showed the possibility exists, while the open-bite was relieved simply by insertion of a tongue crib.