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css id: What Causes Clefts? No one knows exactly what causes clefts, but most believe they are caused by one or more of three main factors: (1) an inherited. Cleft lip (CL) is a common congenital anomaly that is caused by defective fusion of the medial nasal and maxillary processes during embryologic development. Cleft lip is a treatable birth defect. It happens when the tissues of the upper jaw and nose don't join as expected during fetal development. This causes a.

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Separation includes the bones of the upper jaw and upper gum. It is possible to form a cleft lip, cleft palate, or a combination as the lip and palate develop. What Causes Cleft Palate and Cleft Lip? · Smoking or using drugs while pregnant · Viruses or toxins · Other birth defects. Researchers believe that most cases of cleft lip and cleft palate are caused by an interaction of genetic and environmental factors.

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Cleft lip and cleft palate, disorders which involve incomplete fusion of the structures of the upper lip and or palate, are among the most common craniofacial. Often the cause of a cleft lip and palate is unknown. Sometimes it can happen because there is a family history of the condition. However, sometimes a child is. Cleft lip is a treatable birth defect. It happens when the tissues of the upper jaw and nose don't join as expected during fetal development. This causes a.