Since the introduction of composite resin materials into the field of restorative dentistry in the 1960s, after about half a century of continuous improvement and development, composite resin restorative materials have made great progress in terms of physicochemical properties and aesthetic performance, and have reached the standard of both aesthetic and durable clinical application. Nano-resin has superior physicochemical and aesthetic properties than the general composite resin, and with the joint application of enamel and dentin bonding system, the clinical application of nano-resin direct bonding aesthetic restorative technology in anterior teeth shows many advantages: 1. This creates the conditions for other restorative methods. 2, good aesthetic effect: nano resin color variety can be selected according to the color of the natural teeth in the mouth, the restoration and the natural transition of the dental tissue, compared with the traditional resin, nano resin has a good material chameleon effect, can be coordinated with the natural dentition, gums, after curing without the use of dentin masking agent and cut-end transparent layer can also get similar to the natural tooth color, hierarchy and transparency. 3, high success rate: according to the results of their own investigation can be seen in the immediate restoration effect satisfaction rate of up to 100%, a one-year return visit satisfaction rate of 95.22%, two-year return visit satisfaction rate of 91.8%. 4.Short course of treatment: the number of visits is less, direct bonding repair is mostly a course of treatment, short treatment time, with immediate effect. 5, easy to adjust: can be adjusted at any time according to the specific requirements, repair is also relatively simple, if the restoration is a small local defect can be repaired by sandblasting, coupling, bonding, and then repair the defect; if the restoration is a large area of defect can be completely exhausted after the material restoration, the original dental tissue can still be retained. 6, easy to popularize: nano-resin is a common restorative material in modern dentistry, the treatment cost is lower than indirect restoration, easy to carry out, and acceptable to patients. Nano-resin direct bonding restoration technology also has certain limitations: 1, the concept is new, traditional thinking is not easy to accept 2, the doctor’s aesthetic training and professional technical level requirements are high 3, not applicable to color, morphology, alignment and bite too abnormal teeth 4, not applicable to the bite force is too large or can not be isolated wet operation of the affected teeth