Deteriorating dental work, such as metal, silver, or white fillings, can stain teeth over time. Whether it's vapor rub for colds or grilled onions for headaches…. Dentinogenesis imperfecta is a defect of dentin formation, Discolration on adult teeth the teeth may be discolored yellow-brown, deep amber or blue-grey with increased translucency. American Dental Association E. Treating brown spots on teeth. If your child is taking fluoride supplements now, check the amount of fluoride in your water.