After a Permanent Straightening Service, is left. Dependent upon the length and thickness of you this permanent services could. Chemical Hair Services.. Chemical Hair Straightening Service.. At Taboo Salon we provide chemical straightening services using Extensions. Your natural needs some TLC and weâ€™ve got you covered.. CUSTOMER SERVICE. Customer Service Contact Us. Can I wash my hair after the permanent service? We recommend that you donâ€™t for the first four days after your service.