For the short term, yes. I know someone who has used them for many years. There do not "seem" to be problems caused by them .....yet.
Keep in mind, they are full of chemicals. Sometimes it takes a long time for the problems to come to light. I do not know if anyone has done any long term studies on the effects.
There is a reason you were blessed with the hair colour you have, to tamper with it eventually results in disappointment.
I can explain better in a manner that you must go to a drug store, there on a few shampoos you will read "Hair repairing serum for damaged hair by dyes.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.