Remedy is always based on the patients expectations. If you expect your eating capacity to improve you need to remove the badly decayed teeth and u need to go for teeth replacement fixed or removable. If you need just a disease free oral cavity you need to knock off your decayed teeth.
And cost of course will be based on what treatment you wish to continue..
Next Steps
Consult dentist asap
Health Tips
Careful regarding heavily decayed teeth, treat before it starts paining