I coloured my hair since last 15 years. I feel my hair going to be dull and feel loss of some hairs. I often change my colour after 1 to 2 years. I use matrix dark brown colour these days which contains ammonia in it. Is it safe for me. Or I should use ammonia free colour. What should I do for to prevent my hair loss and dullness. Please suggest me any colour and some treatments or home remedies or diet. Thanks.