When going through this kind of treatment, and, in general, eliminating as many chemicals as you can is always best. But, it is nice tobe able to dye your hair and polish your nails, I understand completly. Try and get the natural products and do them at home instead of going to a salon-they are very toxic typically.
Also, the products they use are more toxic as well. Try to find natural alternatives such as:
http://gonatural.biz/, http://www.zoya.com/, and many others.