It is normal to floss after a filling. Generally, flossing is applied on the adjacent side of the tooth, that is, between the teeth. If it is to repair the cavity on the joint surface, there is no direct relationship between filling and flossing, so there is no much influence. If the cavity on the adjacent surface is a cavity between the teeth, if the cavity is repaired, you can check whether the repair is smooth when flossing, and the professional dentist will apply the molding piece to repair the cavity on the adjacent surface, and the shape of the crown after the repair is the same as the original one. In this case, there is no problem to apply dental floss, it can pass smoothly and can remove the plaque and food residue within the gap of teeth.