Chen Mu estimated that even if King Lu wanted to break his head and thought of the two micro-carved ladies in his mouth, he could not think that Wanli asked him to come to Asia to study.

But then again, this is the first time Chen Mu has seen someone use ivory to fill his mouth.

Dentist is not a product of the new era, but it is not divided into separate disciplines and belongs to the major clinical practice in traditional Chinese medicine.

The earliest understanding of tooth decay in the Central Plains was found in the more than 100,000 oracle bone inscriptions unearthed in Yin Ruins. There was a difference between "tooth" and "cancers", and there were small fragments on the painting.

However, tooth filling was not available until the Han Dynasty. At that time, we were not using solid materials, but used elm bark, cinnamon and several other drugs to fill the teeth. Zhang Zhongjing was also first-class in the root canal treatment of killing nerve lines.

Real tooth fillings will have to wait until the Tang Dynasty.

According to the official herbal version of the Tang Dynasty, "Xinhui Bencao", the official herbal version of the Tang Dynasty, the filling material is synthesized from white tin, silver foil and mercury, and the filling tooth is hard as silver.

This technology, also known as amalgam filling, was used until the early 1990s and was still used on a large scale in my country. It was still used in some parts of the world until the 21st century, such as low-income people in the EU, because this is insurance.

However, many countries have banned this material in the 21st century. Although it has not been proven to be harmful to teeth fillers, technical errors in the mixing of amalgam can easily cause harm to dentists.

Even if there is no mistake, mercury will evaporate at room temperature, which will also cause contamination to the dentist.

Of course, Mr. Lu Wang is not a low-income group, and this is not suitable for him.

The silver-amal filling is not very good-looking and will turn black after using it for a long time. Ordinary people only use this to repair the back teeth.

Having said that, this is just a joke. The real reason is that this technology is used for tooth filling. Mr. Lu Wang broke his teeth and had to be inlaid. Even if he wanted to use silver and amalgam to repair it, he would not be able to use it.

He can only inlaid teeth. This technology was only available in the Song Dynasty and was very popular. Naturally, it had to be divided into different levels, including beeswax molds for poor people, wooden dentures, and copper wire ligation. The rich and rich children had more choices, including gold and silver wire, gold and silver teeth, cow bone teeth, sandalwood, and it was really not possible to get ivory rhinoceros horns.

But those who play with micro-carving on dentures like Prince Lu are really rare and cruel people.

Not to mention anything else, who can stand eating a leek dumpling?

Chen Mu always wanted to see it, but after coaxing Lu Wang for several days, this kid just didn't eat leeks.

Not only do he not eat leeks, he doesn’t eat anything that may be hung on his teeth, but he also likes to brush his teeth, and can brush his teeth four times a day and rinse his mouth twelve times.

Of course, bad teeth and tooth loss are a big problem that plagues people all over the world, and dentists are not unique in traditional Chinese medicine.

The Egyptians put gold thread on their teeth in two thousand BC. When Chen Shigong was still in the East, he dug up the skulls of the indigenous people while burying the anatomical experimental materials. Those who were playing on their teeth were almost as good as Lu Wanghua.

Some specialize in the decoration of teeth grinding tips, drilling holes and jade inlays, and some are made of bone or shells to inlay dentures. The existing technical conditions of the Dongyang Military Office cannot carefully distinguish the real materials of those dentures.

Even the military doctors of the Kingdom of Aylan mentioned the craftsmanship on teeth in their letters sent back to the military palace. They were Celtics of the past, but they left behind more harsh techniques, and they directly drilled the teeth into the jaw bones with iron nails.

According to the analysis, the teeth do not match the size and shape of other teeth of the user. It is suspected that they were pulled directly from a dead person's mouth and nailed it into their own mouth.

This matter is related to eating, eating is related to living, and basically the race that can survive. Although the technical means are of their own level, if you have Yangguan Road and I have a single-plank bridge, you are probably all warriors who have passed this level.

Chen Mu felt that the whole world was the one who had the most say in science and technology. He was now, not the commander who was full of science many years ago, but now he was now.

Now he knows too much about what science and technology is, and this thing is not that mysterious.

Simply put, there is a requirement that generates a purpose through this requirement, and then try any possible one after another.

To be honest, whether the problem can be solved and this need can be met depends on luck.

Because he is now a scientist, when the Spanish king's messenger had arrived at Daxi Port, he had no time to pass, and his mind was full of other things.

"You should learn to imitate irons from the masters at the royal university first. What, blacksmith? Not blacksmiths. We call metallurgy."

Chen Mu read the documents for a while on the second floor of the military government office in Mo County, and finally put the documents on the table, and said to Lu Wang: "This is also a contribution to you, a great contribution - we have discovered a new mineral in Mexico."

"At present, I think the teacher who is most suitable for the vassal lord is not in Mo County. He is in Muye and completes his own research. The king first learns metallurgy and has the opportunity to participate in the research of this new material."

Lu Wang followed Wanli. Although he was only sixteen years old, he was not a person who had never eaten anything. He raised his chin slightly, and his face showed a sense of pride, and said, "Wow, materials science, I know that in Tsinghua Garden, it is the best steam warship for the emperor to check which of the thirty-seven kinds of wood is the most suitable for the steam warship."

"It's easy to get it!"

After saying that, Lu Wang, who was sitting on the chair, looked forward and said with interest: "What material is the new mineral that the second uncle mentioned?"

Lu Wang was interested, which was good news for Chen Mu. He took a document and pushed it across the long table, saying: "This kind of mine was actually discovered in Jiexian County, where the Tianjun landed in the New World, but at that time we thought it was a poor tin mine."

"Later it was used as projectile production, and it was also used as projectiles for the bird gunners of the inspection department. Because the tin is lighter than lead, our flag army still needs to use lead bullets, which has greater lethality. Only the smuggling merchants dealing with by the inspection department. Most of the robbers do not wear armor, so it doesn't matter if they have less power."

"This year we also discovered this mine in the northern part of Mo County. Master Zhang from the royal university was the first to be a military craftsman. He made sailor axes and armor for people at the Changsheng No. 2 store. During the iron smelting process, he accidentally dropped this ore into the cooked iron."

"That furnace of steel was destroyed, not even as good as pig iron, and it was broken when knocked; this made us realize that there was something else in that ore, besides tin."

King Lu widened his eyes: "What's the use of this thing?"

"After listening to me, adding less new ore during the steelmaking process will become brittle; but adding more will make the steel produced extremely hard and tough."

"But at present, we don't know what the new mineral looks like after removing impurities such as tin and wool lead, nor do we know the proportion of steel that can be processed with it, nor do we know what this can be done - it all needs to be tested in subsequent experiments, and this is what the king wants to learn."
Chapter completed!