Your brush from CND will come to you with the hairs 'sealed' in Guar gum.
First you must remove this gum from the brush.
Take a lint free pad and wrap it around the hairs and squeeze hard a few times between your thumb and index finger to 'break the gum then take your pad and, still using your thumb and index finger, separate the hairs of the brush thoroughly - at this stage it will look like the brush has a case of dandruff!!
Then using clean monomer liquid, saturate the brush and draw the brush out against the side of the dappen dish - from the ferrule (metal bit) to the flags of the brush (the tip)- first one side and then the other -creating a flat sided brush. Do this about 20 - 30 times ALWAYS drawing the brush out on the SAME flat sides. then throw away the monomer liquid which is now contaminated with guar gum.
It is important to never touch the hairs of the brush with your fingers, and to always use the brush exactly the same way. This will train your brush perfectly. If you use it differently or allow anyone else to use your brush (a sackable offense to me) they will undo all the training you have put into it and it usually never works the same again. Also never use your brush in monomer other than the one you use every day.
The brush is a quality instrument and should be exclusive to you.