The GOOD NEWS is that the odor will go away and is generally only noticed when the hair is wet. Depending on one’s hair type and texture, some people experience a lingering odor, but it will go away as you continue to wash your hair.  This could be a result of NOT having rinsed enough when you did the treatment before you did the blow dry.  If you did not get your hair 100% dry before you flat ironed when you did the treatment, that could also have caused this to occur.