1. What is hair density
Hair density refers to the number of hair strands growing per square inch of your scalp. Typically, we have 80,000 to 120,000 hair on the scalp, and hair density is generally at its highest around the hair vertex (crown). There is no clear definition of good or bad as hair density being too high or too low, but one study in 2018 did identify that Caucasian descent has highest density when compared with Hispanic and African descents. Although hair density level is mainly determined by genes, other factors can also affect your hair density, such as age, nutrition deficiency and stress levels. For hair stylists, knowing the hair density levels is necessary to cut hair and to apply the right hair styling products. Meanwhile, monitoring hair density also helps dermatologists to determine if you are suffering from hair loss problems.
To assist diagnosis of hair density, a scalp and hair image needs to be taken under the PPL light using the Chowis Mobile Analyzer for Hair. Our companion algorithm them evaluates the hair density for the image and provides the hair density grade.
2. Chowis hair density grade
The following Chowis hair density grade has been co-developed by Chowis and dermatology experts. To obtain the hair density grade, we first detect hair and calculate hair density to provide a quantified Result score for the image. Then we grade hair density as clear, almost clear, mild, moderate and severe based on the scale shown in Table 1.
| Grade | Scale | Description |
|---|---|---|
| Clear | 91 ~ 99 | The person has hair thicker than average |
| Almost Clear | 75 ~ 90 | Good hair density: no need to be concerned about hair loss |
| Mild | 50 ~ 74 | Normal hair density |
| Moderate | 25 ~ 49 | Low hair density: starting to notice hair thinning |
| Severe | 0 ~ 24 | Very low hair density: suffering from severe hair loss |
| Clear |  |  |
| Almost Clear |  |  |
| Mild |  |  |
| Moderate |  |  |
| Severe |  |  |