Basically, bleaching is a chemical process which is widely used to lighten up dark manes. In this process, the natural pigment from the hair strand is stripped off by opening up the follicles. In fact, this is an essential step that not only lightens, but also makes the strands porous to better absorb the dye.
When you go for bleaching, the first thing that needs to be taken into consideration is the hair health. Regular deep conditioning for a couple of weeks is highly beneficial in this regard.
Read the instructions provided on the label of the kit and strictly follow them while mixing the bleach with the hydrogen peroxide. Leave the mixture for a minute so that they combine correctly.
One of the most important tips is that you should keep a gap of 2-3 days in between two bleaching sessions. This will give the mane some time to repair the damages. Do not hesitate to consult a professional if you are in a fix.