To ensure minimal damage to the hair after it's been colored:
- Follow any hair coloring session with a high quality DEEP conditioner.
- Follow the deep condition with a lemon rinse or an ACV rinse to ensure the cuticle is flattened properly.
- Moisturise your hair daily to re-fortify it.
Making the color last:
- Don't shampoo your hair with a sulfate shampoo. This is identified on shampoo bottles as: sodium or ammonium lauryl or lareth sulfate. Sulfate rich shampoos are very strong and will make the hair color wash out more quickly.
- Deep condition regularly.
- Ensure your hair never gets dry.
How Often Should You Color The Regrowth
Due to the curly nature of our hair, you can wait a while before the regrowth starts to really show, probably as long as 6 to 8 weeks. If you're not bothered by having two colors of hair then I would wait as long as 3 months before coloring your hair again because dyes, even the natural ones, are a chemical that can cause hair damage.
The whole process of lifting the cuticle and flattening it again happens whether or not the hair dye is derived from natural or synthetic sources. As such you will always lose protein in the process thereby weakening the strands.