Definitely consider a protein treatment followed by a deep treatment, or try Curl Junkie Repair Me, which is a protein treatment and deep treatment in one.

When I have damaged by hair with heat (and also with dyeing it), I use the Repair Me followed by a deep treatment (even though the Repair Me is supposed to combine protein with deep treatment).

I've sometimes dyed my hair and been so horrified with the results that I dyed it again (permanent dyes) the very same day. My hair becomes limp straw - without a curl in sight. That's when I follow the routine above.

Good luck - your curls will come back for sure. There just sick - not dead. As long as your hair isn't breaking or splitting, they will revive. Please let us know how it is going.
2/c-3a Coarse hair med. density.
Protein sensitive but can use occasionally
Highly porous. Color over grey.
I love all the Curl Junkie products and use CJ CCCL as my main styler. Still hoping for 2nd day hair....
Every day is a gift