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The Cuticle
These are the waves that we see under the microscope. A thin layer of cells that slide over each other, almost like tiles on a roof.
In the same way, these ‘tiles’ stop harmful chemicals from entering the hair shaft and consequently keep them healthy.
They also provide protection from outside forces such as bending, combing and blow-drying.
In thick hair types, there can be six layers of cuticular cells, whereas thin hair may only have two layers. This shows how certain hair types may be more prone to chemical and physical damage than others.