Dental filling is filling treatment, filling treatment after two weeks has been toothache may be filling is not cushioned, flow of electricity, caries removal is not net, endodontitis and other reasons, specific as follows. 1. Filling without cushioning: filling treatment for medium and deep caries should be cushioned first, if silver amalgam is used for direct filling, it can conduct cold and hot stimulation leading to toothache, if composite resin is used for direct filling, it can cause chemical stimulation to the pulp, causing toothache. 2. Current electric effect: When using silver amalgam filling treatment, if there are different metal restorations on the opposite jaw teeth, it will form current electric effect and cause pain. 3. Remove caries uncleanly: The carious tissue left at the bottom of the cavity is not removed cleanly, which can make the lesion continue to develop and involve the pulp, causing pain. 4. Pulpitis: When the pulp is exposed during filling or when there is already pulpitis, it will cause tooth pain all the time. There may be other reasons for the toothache after two weeks of filling treatment, it is recommended to go to the hospital in time, after clarifying the cause of the disease for targeted treatment.