If you take coumadin, (warfarin) is it safe to have a dental procedure?

A qualified Yes. You certainly can have dental work done, but you must be sure to get the appropriate clearance from your physician. In some instances you might need to stop the medication before treatment, in other cases you might not. Please consult with your physician and dentist to determine what is best for you.
Sure. But if your inr is below 2.5 and gentle surgery is done. Regular dental work can be done with caution. Please consult your dentist and cardiologist.