**3.6. Color stability**

The color stability of ceramic brackets throughout orthodontic treatment is an important characteristic. It has been stated that ceramic brackets, both monocrystalline and polycrystalline, undergo a color change when subjected to coffee, black tea, coke, and red wine [21, 23, 24]. It has to be pointed out that these are in vitro findings. In vivo studies concerning the color stability of ceramic brackets are lacking.
