Deep caries fillings generally last about five years, due to dietary habits or deep caries caries degree of caries is different, the specific use of time has some differences. Deep caries refers to the symptoms of more serious dental caries and large defects in the hard tissues of the teeth; its treatment is also caries filling and restoration, i.e., filling, the filling process is the doctor using oral professional tools to polish and clean the carious parts, and then fill up the defective parts with filling materials (e.g., tooth powder, resin, etc.). Due to deep caries defects, fillings generally last for about five years, and after the operation, we must try to avoid eating too hard and sticky food to avoid chipping and falling off of fillings; in addition, we must maintain good oral hygiene to avoid recurrence of dental caries; in order to effectively prolong the use of fillings.