You can use Deep Red as much as you desire. Deep Red will not damage the hair, and as explained, with red, sometimes it needs to be built up. Therefore, if you want to undertake successive treatments, one after the other, you can. If you want to use daily, you can. If you want to use weekly, you can – it will not damage the hair. It’s entirely your own choice how often you want to use the product. And over time, you will begin to understand how often you need to use the product to retain your specific result. Deep Red consumers come to the product to retain reds, so will initially find they are using Deep Red more regularly – but as the condition improves and the red fills the hair, they always notice less fading and frequency of use reduces.