Hi, I have a client with shoulder length hair. She has been having hi lites for a couple of years now bleach and 20vol. She uses clip in hair extensions and uses a lot of heat and the damage is now beginning to show. She does not get it trimmed regularly. She now wants to go a dark brown as she feels it will look glossy and disguise the damage. She is looking at around a 5, 5/3. I have discussed various alternatives to improve the condition, Not so much heat, not using the extensions, treatments. None of these she will do. If I were to go ahead with the colour change would I need to pre pig first. The last colour we did was hi lites bleach and 20 vol, with some 6/0 scattered to break it all up which she loved. Any advice is greatly appreciated.