If there is a slight soreness after just filling the tooth, and the symptoms gradually reduce is the normal reaction after filling the tooth.
Teeth for oral filling and restorative treatment, if the caries area is large and the cavity is deep (such as deep caries); in grinding away the decayed tissue cold water or debris will cause some stimulation to the pulp tissue, in addition to filling materials used for filling (such as tooth powder, resin, etc.) also have a slight stimulation of the pulp tissue.
Therefore, it is normal to have a slight soreness after filling, and the symptoms will be gradually reduced in a week or so; however, if there is obvious pain and discomfort after filling, and the symptoms gradually worsen, it is recommended that a timely follow-up for symptomatic treatment, so as to avoid delaying the condition.