In order to avoid the cavity of tooth decay from getting bigger and bigger, there are many tooth-lovers who choose the restorative treatment of filling, but for some reason, the filling material falls off for some patients after filling. So, what are the reasons for tooth filling material falling off? 1.Seriously decayed teeth For the serious decay that leads to the large area of tooth damage, presenting deep caries, multi-surface caries, etc., these cases are very likely to cause the filling material to fall off; some seriously decayed teeth also have the situation of unstable retention, which is very likely to cause the filling material to fall off. For this kind of tooth decay, it is usually necessary to fix the tooth first and then repair the tooth with porcelain, or extract the tooth. 2.Tooth fracture The tooth fracture mainly occurs in the dead pulp tooth, because the dead pulp tooth has no nutrition supply, it is easy to fracture, plus the improper use of the tooth, it is the tooth fracture, which will definitely lead to the filling material fall off, for the tooth after the root canal treatment is generally not advocated for filling, can carry out porcelain tooth restoration to protect the tooth. 3.For secondary caries repair improperly Each kind of filling material is suitable for different tooth parts, and it is necessary to make proper selection when carrying out filling, for secondary caries can not carry out filling solution, it is better to use porcelain tooth restoration, because filling are this kind of situation of caries, the effect is very bad, it is easy to have problems, and also waste a lot of time and energy of patients. 4.Filling material fracture Caused by filling material fracture is mostly seen in the tooth whose tip is in close contact with the filling material, which bears more chewing pressure than other teeth, medically known as traumatic dentition. Traumatic manifestations in the crown are commonly seen in the fracture of the crown, especially in adjacent cavities, causing fracture of the crown and filling material on one side. Clinically, metal shell crown technique is often used to restore the solution. 5, improper use by the patient The filled tooth needs to be protected by the patient, do not eat more viscous and harder food, due to the patient’s negligence and carelessness, it will also eventually cause the filling material to fall off. Of course, the technical level of the filling doctor is also one of the reasons, the filling material is not filled tightly, which will also lead to the filling material falling off.