If you chewed gum before asking this question then yes yes it does
Exposure to lead can also cause mental retardation.
Overstudy does not cause mental retardation.
In about 35% of cases, the cause of mental retardation cannot be found.
Copper deficiency in children is associated with growth retardation. Zinc deficiency, Vitamin A deficiency and other nutritional deficiencies can also cause growth retardation.
The two conditions are not at all related. Autism does not cause mental retardation.
Hyperthyroidism, whooping cough, chickenpox, measles, and Hib disease (a bacterial infection) may cause mental retardation if they are not treated adequately.
Maternal infections and such illnesses as glandular disorders, rubella, toxoplasmosis, and cytomegalovirus (CMV) infection may cause mental retardation
An infection of the membrane covering the brain (meningitis) or an inflammation of the brain itself (encephalitis) cause swelling that in turn may cause brain damage and mental retardation.
No.
cause you chew it and its called gum...
iodine
Hyperthyroidism, whooping cough, chicken pox, measles, and Hib disease (a bacterial infection) may cause mental retardation if they are not treated adequately