Liu Fan's abnormal behavior immediately attracted Shuying's attention, and Shuying was already a little used to her husband doing some inexplicable things at every turn. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 After asking the reason, Shuying suggested to Liu Fan, "Husband, since you can't do it yourself, why don't you ask Xu Ge Lao?" Mr. Xu is well-versed in Chinese and Western studies, knowledgeable, astronomical calendar, mathematics, and agriculture, and he thinks he must have a way! ”

Liu Fan had no choice but to nod yes, in fact, he didn't want to trouble Xu Guangqi too much in his heart, because Xu Guangqi's health was not good, Liu Fan didn't want him to worry too much because of these little things. But now, with a "technologically illiterate" like Liu Fan, there is no way to drum up these things.

In order to ensure that his plan would not die young, Liu Fan could only come to Xu Guangqi's house for help early the next morning. After a few days, when he came to Xu's Mansion again, Liu Fan was pleasantly surprised to find that his teacher Xu Guangqi's health had improved greatly, which made Liu Fan very surprised, and the guilt in his heart was suddenly reduced a lot. After Liu Fan explained his intention and took out the "toothbrush" he invented, Xu Guangqi laughed: "Jimin's toothbrushing is quite chic!" Ji'er, go and I'll show those few toothbrushers in our house to Jimin! ”

"Yes, Father!" Xu Ji's face turned red, and he couldn't help but smile and glanced at Liu Fan and turned to leave.

The strange attitude of the Xu family's father and son made Liu Fan have a bad premonition in his heart, and after hesitating, Liu Fan couldn't help asking, "Teacher, what is this toothbrushing?" Could it be that we already have a toothbrush? ”

Xu Guangqi laughed, looked at the wooden-handled toothbrush in his hand, and explained to Liu Fan, "Hmm! The toothbrush you made, in fact, we have it, and it's basically the same as yours. ”

Liu Fan was stunned and said, "It's already there!?" Or about the same? No way! Then why haven't I seen it! ”

Xu Guangqi smiled and said: "The toothbrush has had a prototype since the pre-Qin period. At that time, most toothbrushes were made of animal bones, which was relatively rudimentary. In the two Song Dynasty, the toothbrush has developed greatly and began to prevail, and the toothbrush at that time has been made of exquisite price comparison, and the bristles have been made of horsetail, pig bristles and other things. In this dynasty, Emperor Xiaozong improved the process of toothbrushes, inserting short and hard pig hair or horsetails into a bone or copper handle, and toothbrushes began to prevail in the Ming Dynasty. Because toothbrushes made from horsetails or bristles were expensive and far from being available to ordinary people, these things were only circulated among royalty and wealthy nobles. Ordinary people or businesses are still using willow branches, which is a cheap and practical method. Now you know! ”

While the two were talking, Xu Ji trotted all the way to the two of them and said to Xu Guangqi, "Father, I have already brought the brushing tools you want!" ”

Xu Guangqi nodded and said with a smile: "Take it to Jimin!" ”

So Xu Ji handed the toothbrush in his hand to Liu Fan, Liu Fan took the toothbrush handed by Xu Ji and was shocked, it turned out that the toothbrush that Xu Ji handed over to Liu Fan was almost the same as the toothbrush made by Liu Fan according to later generations, even more exquisite than Liu Fan's, even the handle is made of fine red copper, not only the handle is curved, but also carved with many patterns, and the toothbrush made by Liu Fan is more ugly than the comparison.

At this moment, Liu Fan's mood was both embarrassed and shocked, he didn't expect that the toothbrush he had worked so hard to make Daming had already existed, and it was so advanced, could it be that Daming's technology had reached this level? Thinking of the earliest rockets and grenades such as "Divine Fire Crow" and "Poisonous Fire Bomb" that have appeared in Daming, the corners of Liu Fan's mouth are full of bitterness. Damn, is my Daming's technology already powerful to this extent? How can a time-traveler like him live? It seems that the plan to make money is completely ruined!

Liu Fan's unpredictable face Xu Guangqi looked at it one by one, and seeing Liu Fan's embarrassed and depressed appearance, Xu Guangqi comforted him warmly, "Jimin, in fact, your idea is still good." After all, the toothbrushing used by dignitaries was expensive and difficult to spread among the common people, and if cheap wood and wool could be used instead of expensive horsetails and bristles, there was still a lot to be done. ”

Xu Guangqi's comfort did not make Liu Fan's mood improve, Liu Fan looked at the delicate "brushing teeth" in his hand, and said dejectedly: "Teacher, you don't need to comfort me, I know all these truths." It's just that I didn't expect Daming to have a toothbrush now, it seems that I am busy in vain! Teacher, now that you have a toothbrush, you must have already seen toothpaste! ”

Xu Guangqi stroked his beard and smiled: "Jimin is talking about dental medicine!" Indeed, there is already such a thing. Since the Song and Song dynasties, there has been tooth powder, at that time the tooth powder was mostly made of animal bones, soaphorn, lotus leaves, green salt and other medicines. With the evolution of time, the wealthy nobles added pine resin, Sophora sophora powder, flower ling, agarwood, white sandalwood, Suhexiang, clove bark and other medicinal materials to it, and finally formed the most widely used dental medicine now! ”

Liu Fan muttered blankly, "I know!" It's over, it's really over. ”

Xu Guangqi shook his head and said, "Jimin, although these things are available, but their cost is still too high, the old man still says that, your ideas are still promising!" ”

Liu Fan's eyes lit up, he stepped forward and grabbed Xu Guangqi's arm, and asked hopefully, "Teacher, are you telling the truth?" ”

Xu Guangqi smiled: "Hmm! Although the toothbrush you make is a little crude, it is cheaper and can be used even by ordinary people. And because of his interest, the old man happened to find that one thing can replace green salt, if these two are combined, Jimin's idea can be realized! ”

Liu Fan was overjoyed and said, "Teacher, what can replace Qingyan?" Tell me quickly! ”

Xu Guangqi said with a smug face: "It's raw gypsum!" Raw gypsum, also known as fine stone, also known as "cold water stone", can treat stroke, cold and heat, has the functions of relieving muscle sweating, removing dry mouth and tongue, headache and toothache. It is a good medicine for dispelling plague and relieving fever. According to the old man's research, raw gypsum has a very good effect on cleaning teeth, and this thing is inexpensive, very suitable for large-scale promotion, if you fill in some mint, licorice and other substances, it can completely replace green salt to become a new tooth medicine, oh, it is toothpaste! ”

Liu Fan was a little puzzled and said, "Raw plaster? Isn't that what you use to build a house? Can you put that thing in your mouth? ”

With a "snap", Xu Guangqi took the scroll in his hand and gently tapped it on Liu Fan's head, blew his beard and glared and scolded with a smile, "Who told you that raw gypsum is used to build a house?" If you don't learn it, raw gypsum is a kind of medicinal material, and it is clearly recorded in the "Compendium of Materia Medica", if you don't believe it, you can check the book. Hum! Do you think the old man will lie to you? (To be continued.) )