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 hairs 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, up to 5 images can be taken under the XPL light using the ChoiceTech Hair Analyzer. Our company algorithm then evaluates the hair density for each image and provides the final hair density level.
2. ChoiceTech hair density grade
The following ChoiceTech hair density grade has been co-developed by ChoiceTech and dermatology experts. To obtain the hair density grade, we first detect hair and calculate hair density to provide a quantified result score for each image. Then we compute the final score for hair density as the average of all result scores. Finally, we grade hair density as excellent, good, moderate, poor and very poor 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 |
| Moderate | 50 ~ 74 | Normal hair density |
| Poor | 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 |  |  |
