The best option can be decided after seeing the x-ray of the teeth and also general condition of the mouth. If your teeth have good bone support, general condition is good and the roots are not below gum level; best option would be to treat the roots and get post and core restoration for the teeth on natural roots. In case it is not then there can be two options taking out the roots and making a fixed denture, may be a removable denture and implants later on.