In ancient times, the overall productivity and scientific and technological level of society were relatively limited. Things that are easily explained by modern science and accepted by everyone often make people panic and don't know how to start. So I can only summarize it in general. The "one size fits all" approach has a feeling that we can't afford to hide. It is a good thing to take a bath regularly to keep your body clean, but in ancient times, people couldn't keep warm well in many places, and there was no fixed bathing place. In that environment dominated by traditional morality, it is unknown whether personal privacy can be well protected. Since ancient times, the south of China has been too wet and cold, while the north has been dry and cold. It is comfortable to take a bath, but a gust of wind is likely to catch a cold. You know, in that era when there were no antibiotics and other western medicines, an insignificant little cold could kill you, so people's attitude towards bathing can be imagined.

In ancient times, people used two cleaning tools to wash their hair, one was Gleditsia sinensis and the other was Polyporus umbellatus. Among them, the second one can be used by anyone who wants to use it. Polyporus umbellatus can be mixed with some spices after simple processing, and the effect is good. However, due to the small quantity and high price, it must be used by families with certain economic strength, and most families still use Gleditsia sinensis. If it is in a cold winter, a cold may be fatal, but it was not an ordinary cold in ancient times. Therefore, ordinary people would rather not take a bath than make fun of their own lives. Some places still have the habit of taking a bath, such as nomads, who only need to take three baths in their life, once at birth, once at marriage and once at death.

At first, ancient baths were only located in palaces, temples and inns for emperors, ministers and monks to bathe in. Huaqing Pool in Lintong, Shaanxi Province has been excavated completely, which is a bathing place for emperors and concubines in the Tang Dynasty when they are happy. It was not until the Song Dynasty that commercial baths began to appear. Where the bath is located, the pot is hung on the door, and "hanging the pot" has become the symbol of the bath. The Tang Dynasty was an era of bathing. According to historical records, Chang 'an, the capital of the Tang Dynasty, once had a grand occasion of bathing in a street, from the emperor to the imperial concubine, the lower class and the common people.