Hairfall never happened due to colouring. There are many reasons for hair fall. So first and foremost we have to find the cause with the help of detailed history and examination. Some of the common causes are nutritional deficiency, hormonal causes like androgenic alopecia or patterned baldness, hypothyroidism, telogen effluvium etc. Unless we find and treat the cause there is no point in giving non specific treatment. Oils or shampoos do not have any effect on hair growth as they are not absorbed in the skin. Please call me or send photographs using online consult option for proper diagnosis and detailed prescription.

Which color are you using. Use any good brand. If you have problem of hair fall do some lab investigations to find is their any ither reason for hair fall like Hb and thyroid.