Hello, There are some cosmetic procedures possible. Fluorosis is a common cause for this condition. The pulp chamber of the teeth may decrease in size with age and affect the color of the overall tooth. Some severe cases of mottling are at higher risk of decay. Cosmetic concerns can be very personal and today s procedures offer many options. -Whitening or bleaching procedures can make the spots appear more blended. There is no guarantee on the amount of change, but if result may be satisfactory. This procedure can be repeated and does not prevent trying any other procedure. Whitening toothpaste can be a first step and helps to maintain the shade. There are take home methods and in office treatments available. Your son, being young, would need to be evaluated by the dentist. Age, large nerve chambers (pulp), and sensitivity are concerns. This is best for mild case and can be repeated. -Micro and Macro Abrasion removes a layer of enamel. The teeth are polished. This procedure can not be reversed and is best for mild to moderate conditions. This does not need to be repeated. -Bonding or veneering teeth is a procedure where a composite material that matches or is lighter than the natural tooth shade is layerd on top of the tooth. This can be a thin, additional layer covering the entire tooth, which would be reversible by a dentist or may include some removal or reshaping of enamel which would make it not reversible. Fracture is a risk or wear can occur requiring replacement. This is best for moderate to severe cases. Porcelain veeners are a stronger, more color stable material that cover teeth and can provide multiple shade selections. Thin to thicker veneers are possible with varing amounts of enamel alteration performed. This is the most expensive option. Veneers may fracture or need replacement. This can be best for severe and weakened enamel. I hope this offers you a solution for your son and you find my suggestions helpful. Please do not hesitate to ask additional questions. Thank you for your inquiry.