Here are some guidelines 一般指南：
- Wavy hair tends to need more protein than straight hair.
曲髮一般比直髮需要多點蛋白質。 - If your hair is damaged, it will need more protein.
如果你有受損髮質，你需要多點蛋白質來修復。
Introducing porosity 頭髮多孔性
When considering how much protein is needed, hair porosity is key. The hair cuticle resembles a pinecone.
要知道需要幾多蛋白質，頭髮的多孔性好重要。頭髮嘅毛鱗片好似松果。
- Low porosity hair looks like the left
低等多孔性嘅頭髮毛鱗片比較緊，似左邊松果 - Medium porosity hair looks like the middle
中等多孔性嘅毛鱗片係半開狀態，似中間松果 - High porosity hair looks like the right
高等多孔性嘅毛鱗片開得比較鬆散，似右邊松果
The higher the porosity, the more protein our hair needs.
多孔性越高，頭髮就越需要蛋白質。
Image from Curly Girl: The Handbook by Lorraine Massey and Michele Bender
How do I know what porosity? 點知自己頭髮多孔性？
If you jump into a pool and your hair is saturated immediately, your hair has high porosity. If it takes several dips to fully saturate your hair, your hair has low porosity. If it’s in between, you have medium porosity hair.
如果你跳入泳池，頭髮好快就濕透，咁就係高等多孔性。如果你浸幾次先濕哂，就係低等多孔性。如果介乎兩者之間，就係中等多孔性。
Protein–Moisture balance 蛋白質水分平衡
People with high porosity hair need more protein to fill the empty space in the cuticle, this strengthens the structure of the cuticle and helps the hair retain moisture better. They also need a lot of moisture hydrate their hair.
高等多孔性頭髮要多啲蛋白質去填補毛鱗片嘅空隙，強化頭髮結構，減低水分流失。高等多孔性頭髮同時亦需要好多水分。
The balance between protein and moisture is key to healthy hair. Too much protein leads to stiffness, dryness, and breakage.
蛋白質同水分嘅平衡係頭髮健康嘅關鍵。蛋白質太多會令頭髮變得乾燥、僵硬、甚至斷裂。
If you think your hair has too much protein, follow the steps on this page to restore moisture.