Composite resins are, undoubtedly the most important discovery in dental science in the last three decades. Today, esthetics and restorative dentistry are unthinkable without composite resins. These dental materials deserve attention of the dental scientists and the dental practitioners who are interested to reach the good results which are the imperative of modern dentistry. Until now the three generations of composite resins have been developed. The first of them, composite materials with macrofiller are not in operative use today due to their shortages. Composite materials with microfiller and composite complexes with microfiller are good for frontal teeth while the hybrid composite resins are good for bicuspids and molars. Moreover, three generations of dentin adhesion materials for better adhesion of composite resins on dentin surfaces have been developed.