Moisture-protein balance in your hair strands simply refers to the moisture and protein contents of yoir curls, and one should not exceed the other. Excessive protein treatment can reverse all the good you have already received leading to dry, brittle hair prone to breakage.
While excessive deep conditioning without the occasional protein treatment can lead to a condition known as Hygral Fatigue.
So it is crucial to maintain a balance between both.
Still not sure if you need a protein treatment?
Select a piece of your hair, pull it straight to its maximum length, let it go, and watch closely to see if it bounces back to its original and natural curly state and how much it does. This helps you determine your hair elasticity.
If it does not bounce back then it needs protein and its moisture content is becoming damaging, even if the hair is dry at that moment. But if highly elastic but dry, go ahead with a deep conditioning treatment.