What is the treatment of caries on front teeth?

Same as regular, but. Dental caries are rx same way regardless of which tooth involved. However, if it tooth is in or near the front and shows whenever you smile (do that often, please), cosmetic dentistry becomes involved and maintaining the color with whatever material is used becomes important. (during the civil war, the only thing that got u out of serving was missing 4 front teeth (unable to fire rifle): 4f !
Removal/restoration. Remove the decay/caries and place a restoration, unless the caries is very incipient and then remineralization might be attempted.