A few years ago, the restored caries, could only be made with amalgam that its compounds are alloys of silver and mercury and looked aesthetically unattractive. These restorations often weaken the teeth due to the large amount of the original tooth must be removed. There is also a risk of contamination by mercury used for their preparation. Modern dentistry has resorted increasingly to composite resin fillings as a safe and natural alternative. Composite resin fillings used a white plastic and soft substance that hardens with a blue light.
Wear takes place in the tooth, which can be mild to moderate, depending on each particular case. Subsequently the surface is packed initially with an acidic substance which becomes more porous enamel and dentin, then an adhesive is applied so that adequate adhesion between the tooth and the resin is achieved.
When finished, the polishing phase occurs providing a smooth and shiny surface very similar to natural tooth.