Six weeks is too short to produce long new hair. Human scalp hair grows about 1–1.5 cm per month, so in six weeks the maximum new growth would be around 2 cm, not full-length strands. If the “after” photo looks fuller or darker, it’s far more consistent with gray hair being colored plus changes in brightness and contrast, which can easily make hair appear denser.
Why is it fake?
Six weeks is too short to produce long new hair. Human scalp hair grows about 1–1.5 cm per month, so in six weeks the maximum new growth would be around 2 cm, not full-length strands. If the “after” photo looks fuller or darker, it’s far more consistent with gray hair being colored plus changes in brightness and contrast, which can easily make hair appear denser.