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Congenital bifid (split) tongue could give a person a snake-like tongue. This occurs when the tongue is partially split due to incomplete fusion during fetal development. The absence of tongue or aglossia is rarer, fewer than 100 cases have been reported worldwide. Ghost teeth (regional odontodysplasia) is an extremely rare condition where one small area of the mouth develops teeth that are weak because they didn't form properly before erupting. The enamel and dentin are thin and poorly mineralized, so the teeth may look yellow, break easily, or fail to come in completely. On X-rays, these teeth appear almost transparent like ghosts, which is how the condition got its nickname. Only a few hundred cases were reported. Your lips have traits too. Double extremely condition (congenital double upper lip) is an extremely rare condition where a person is born with an extra fold of tissue on the inside of the upper lip. It is usually not noticeable when the face is relaxed but becomes visible when smiling. Fewer cases. Many their complex defects. Roughly 1 in 10,000 people have situs inversus, a condition where the internal organs are a complete mirror image of the normal layout. Many their entire lives without knowing, only finding out by accident or in an X-ray or surgery. But rarer still is situs ambiguus (heterotaxy), where the organs aren't just flipped, they're scattered in irregular, unpredictable positions. It occurs in somewhere between 1 in 10,000 and 1 in 40,000 births and often comes with complex heart defects. Blood types.