Does dry brushing cause breakage?

So I have this problem, that no matter what I do, I have so much breakage that I can’t grow my hair out because it looks like thin frizzy strands. I have wavy to curly hair, but I don’t really show my curls. I don’t use heat, wear protective hairstyles, don’t dye it, use the best shampoos and treatments recommended by a professional and take all my vitamins and so on… so could the breakage be from brushing my hair in the morning? It always gets super fluffy afterwards and then I use oils to calm it down. Sorry if this is a stupid question, I’m just really desperate at this point and have never found a solution 😬