Pain after Treatment ? If a patient had a crown, veneer or a filling placed and within a short time frame it broke then the dentist is obliged to replace it. But what does it mean if a patient begins to experience pain a month or two after a treatment had been placed? Well a month or two is a long time after a treatment to experience pain. This does not mean that it is a fault of the dentist or something that had been over seen at a previous visit.