We can reconstruct the natural dental crown partially or completely by remodelling it with composite. Every colour and light reflection has to be recreated in every single layer of the tooth to simulate a realistic result.
The surface structure is also important . A smooth, highly polished surface for example has too little light reflection and looks very mechanical. To prevent this look we incorporate small dents and grooves into the filling. As a result a lot of small light reflections create and vital and brilliant looking tooth.