Question: what is the best product to straighten hair?
Answer: #10. ...  TRESemmé Keratin Smooth Keratin Infusing Smoothing Serum. ...  It's a 10 Miracle Leave-In Plus Keratin. ...  IGK Good Behavior Spirulina Protein Smoothing Spray. ...  Suave Professionals Anti-Frizz Cream. ...  John Frieda Frizz Ease 3 Day Straight Semi-Permanent Styling Spray.