Hair Wellness Glossary

Crown Environment

The external environmental conditions — including water quality, climate humidity, temperature, and UV exposure — that directly and continuously affect hair health.

Crown Score

A composite hair health metric calculated from scalp condition, moisture levels, breakage rate, growth consistency, and protective practice quality.

Hair Porosity

The measure of how readily the hair shaft absorbs and retains moisture, determined by the structure and behavior of the cuticle layer.

Hidden Breakage

Breakage that occurs gradually during styled periods or daily wear and is not visible until a style is removed or a significant amount accumulates.

Length Retention

The cumulative, measurable result of growing hair and successfully preserving that growth through protective practices, moisture maintenance, and low-breakage handling.

Moisture Imbalance

A state in which the hair has either too little moisture or an imbalanced ratio of moisture to protein, resulting in dryness, brittleness, or limpness.

Protective Style Risk

A composite measure of the potential for a protective style to cause damage, calculated from tension level, extension weight, wear duration, and maintenance practices.

Retention

The ability of hair to hold onto the length it grows without losing it to breakage, splitting, or mechanical damage.

Scalp Barrier

The protective outermost layer of the scalp — the stratum corneum — that regulates moisture, repels pathogens, and protects follicles from environmental and chemical stress.

Scalp Stress

A state of follicular and dermal distress at the scalp caused by tension, inflammation, dryness, chemical irritation, or product buildup.