Dental Health: Cleft Lip and Cleft Palate

Cleft lip and cleft palate are facial and oral malformations that occur very early in pregnancy, while the baby is developing inside its mother. Clefting results when there is not enough tissue in the mouth or lip area, and the tissue that is available does not join together properly.

A cleft lip is a physical split or separation of the two sides of the upper lip and appears as a narrow opening or gap in the skin of the upper lip. This separation often extends beyond the base of the nose and includes the bones of the upper jaw and/or upper gum.

A cleft palate is a split or opening in the roof of the mouth. A cleft palate can involve the hard palate (the bony front portion of the roof of the mouth), and/or the soft palate (the soft back portion of the roof of the mouth).

Cleft lip and cleft palate can occur on one or both sides of the mouth. Because the lip and the palate develop separately, it is possible to have a cleft lip without a cleft palate, a cleft palate without a cleft lip, or both a cleft lip and cleft palate together.

Who Gets Cleft Lip and Cleft Palate?

Cleft lip, with or without cleft palate, affects one in 700 babies annually, and is the fourth most common birth defect in the U.S. Clefts occur more often in children of Asian, Latino, or Native American descent. Compared with girls, twice as many boys have a cleft lip, both with and without a cleft palate. However, compared with boys, twice as many girls have cleft palate without a cleft lip.

What Causes a Cleft Lip and Cleft Palate?

In most cases, the cause of cleft lip and cleft palate is unknown. These conditions cannot be prevented. Most scientists believe clefts are due to a combination of genetic and environmental factors. There appears to be a greater chance of clefting in a newborn if a sibling, parent, or relative has had the problem.

Another potential cause may be related to a medication a mother may have taken during her pregnancy. Some drugs may cause cleft lip and cleft palate. Among them: anti-seizure/anticonvulsant medications, acne medications containing Accutane, and methotrexate, a drug commonly used for treating cancer, arthritis, and psoriasis.

Cleft lip and cleft palate may also occur as a result of exposure to viruses or chemicals while the fetus is developing in the womb.

In other situations, cleft lip and cleft palate may be part of another medical condition.

How Are Cleft Lip and Cleft Palate Diagnosed?

Because clefting causes very obvious physical changes, it's easy to diagnose. Prenatal ultrasound can sometimes determine if a cleft exists in an unborn child. If the clefting has not been detected in an ultrasound prior to the baby's birth, a physical examination of the mouth, nose and palate confirms the presence of cleft lip or cleft palate after a child's birth. Sometimes diagnostic testing may be conducted to determine or rule out the presence of other abnormalities.