This a great video request! I will try to accommodate it as soon as possible, but until then- shedding occurs when the adhesive that holds the bristles together at the base of the brush (the part attached to the handle that holds the bristles) has started wearing down. When you clean your brushes, be sure to have them slightly elevated while they dry (with the bristles going down-handle elevated) so the moisture does not sit where the adhesive lives. Hope this is helpful!
Unfortunately burnt bristles cannot be restored to its original state. 😢 When using heat for a quick dry time, make sure you don’t get the heat too close or too hot for the bristles, especially synthetic brushes. It’s okay if the air pressure is high, but you don’t want the heat on a high heat setting. 💕 Side note, if the bristles are not synthetic, and feel more dry than actually burnt, you could try a conditioning treatment to possibly restore the bristles.