* Comb: Detangling your hair before a perm is important so the perm solution can be applied evenly. Knots and tangles can prevent proper saturation and lead to an uneven perm.
* Scratch: If you need to scratch your scalp before the perm solution is applied, that's generally fine. However, avoid scratching too vigorously, as this could irritate the scalp, making it more sensitive to the chemicals used during the perming process.
It's always a good idea to communicate with your stylist about any concerns you have before starting the perm process.