Hair dye is usually a soluble substance for dyeing or coloring hair. There are mainly two types of hair dyes: completely chemical-based, partially chemical and natural dyes. Under chemical-based hair dyes are permanent, semi-permanent, semi-permanent and temporary hair dyes. On the other hand, natural hair dyes are of two types: henna-based and bio-based. Henna is a plant that grows in dry, hot climates. When its leaves are harvested, dried and powdered and then mixed with a slightly acidic liquid, it will stain skin, hair and nails. Like semi-permanent dye, if it is not reapplied it deposits the color and wears off for a long time. Since henna comes from a plant, it is said to be a healthier option for coloring hair. Organic hair dyes are made from natural ingredients but almost all use active ingredients or chemicals synthesized in a laboratory.2. Chemical Concepts Below are the basic equations of chemical-based hair dyes and examples of their chemical structures. C11H14N5Cl is the generally accepted chemical formula for hair dyes.3. Points of view3.1 Ammonia basedAdvantages:Ammonia has the ability to alter the color of hair without washing it after just a few shampoos. Ammonia also allows color to easily enter the cortex by raising the pH of the hair enough to open the cuticle and allow color to enter the cortex of the hair. Additionally, ammonia neutralizes existing pigments more, which happens when ammonia is mixed with peroxide. Disadvantages: Although the color swells the cuticle to easily enter the cortex, there is a significant loss of protein and moisture. This is how hair is damaged during coloring when using a......paper medium......and an additional coating that henna adds to the strands, which invariably thickens the strands of hair, this can be a disadvantage. This means that the new hair growth will have a different texture and texture than henna-treated hair. That if henna treatments are not continued on the new growth will lead to a line or point of demarcation on the hair strands, this point or line of demarcation becomes a point of weakness. Just like those with chemically treated hair, this two-type hair problem can lead to excessive breakage and/or hair damage.4. ConclusionHenna dye would seem to be a better choice among hair dyes, taking into account its natural-based composition and positive impact on scalp health. However, further development and promotion of awareness of this range of dyes is needed to overcome its shortcomings and make it more attractive to the general consumer.