If you have decay its from not brushing very well in that area. You need to have them filled to have the problem fixed. If you dont have them filled they will become bigger. The larger the cavity the larger change of root canal. Also if you use drugs, it is common that it will cause dcay along the gum line. Youll end up with black spots along the gum line.

Adult decay more prevelant on the front teeth is often the result of pouring carbonated soda drinks over them on a daily basis? If your drinking pop every day the acids inherant to those type of drinks is known in the dental community as one of the single most destructive dietary things you can do to the teeth! Even if it is diet it is not safe!