Not at all. I have been through this treatment more than five times and I still have healthy looking hair. I get compliments every time. Just being very very honest about it.
Don’t be so scared. You need to know more about it. If you take the best care and trim your hair time to time, you will always achieve good results.
Aftercare is extremely important. Hair smoothening is completely safe if done by an expert. There can be extreme cases like if you are suffering from some disease, you must avoid getting it done otherwise you will so enjoy the results, I promise you that.