PT is protein treatment- fantastic for helping damaged hair (can also help perk up natural curls/waves, especially if your hair is fine in texture). DT is a deep conditioning treatment.
Your product choices are best decided by your hair properties (texture, porosity, etc). The right products will enhance your natural wave pattern. Have you considered trying the Curly Girl (CG) method?
3a/f/iii Before the chop- Donated to Locks of Love, January 2013
Modified CG since 11/5/11
CO-WASH: VO5 Vanilla Mint Tea Clarifying, DevaCare No-Poo
CLARIFY: CHS Treatment Shampoo (used prior to PT/DT)
RO: DevaCare One Condition, Regis Olive Oil
LI: Cure Care, As I Am Leave-In
STYLE: Re:Coil, Curl Keeper, Biotera Gel, Deva Ultra Defining Gel, GVP Liquid Sculpting Gel, Curls Rock Amplifier and Strong Hold Mousse
PT/DT: IAGirl's PT, One n' Only Argan Hydrating Mask