Should i be worried that my five year old's teeth are tuning brown?

Brown teeth: I would certainly be concerned , see the dentist to determine what the problem is. It may be dental cavities , stain, or too much Fluoride ( fluorosis ).

Yes.: Teeth turn brown due to staining or cavities. Take your child to a dentist as soon as you can for if it is due to cavities, you want to fix them before the teeth get infected and painful!