Su Mu looked at the toothbrush drawing and found that it was indeed quite simple. It just required some tools.

"Grandpa! I'm here to ask you for help again!" Su Mu said as he walked towards his grandfather.

"Is there another good thing?" Su Dingguo looked at a piece of paper in Su Mu's hand.

"Look! A toothbrush! It's something used for brushing teeth." Su Mu handed the drawing to his grandfather.

"This is easy! I can make it in a moment! It's just that the bristles need to be prepared in advance."

The two began to study how to make this toothbrush, first preparing the pig bristles and soaking them in lime water for a day to degrease them.

The wood is cut into thin slices, similar to the shape of a toothbrush handle, and two rows of small holes are drilled on one end with a tool. The rest is to wait for the bristles to be soaked and degreased before assembling.

The next day, the old man and the young man got up early to make toothbrushes.

Arrange the soaked boar bristles into several bunches, use needle and thread to pass through the middle of the bristles to fix them, and then pass the needle and thread through the small hole in the wooden handle, and you will have a bunch of toothbrush bristles.

Repeat this step to fix two rows of bristles, and your toothbrush is done!

Seeing the toothbrush successfully made, the old and the young smiled happily. Then they continued to make toothbrushes, and soon made a lot of them, and stopped only when all the bristles were used up.

At this time, there were already more than a dozen toothbrushes on the table.

"Kids! Come over here and try out our new toothbrushes!"

We were all waiting outside for fear of disturbing them, but when we heard that the toothbrushes were ready, everyone came in all at once.

The small house, which was not very big to begin with, was surrounded tightly with people.

"Come on, each of you take one and try it out to see if it works." Su Mu called out.

In this way, everyone held a toothbrush, stood in a long row, and brushed their teeth with the toothbrush!

"It works! It works really well, much better than chewing willow branches."

"Nannan, this thing is very convenient. When I get old and my teeth are not in good condition, I don't have to chew those hard willow branches anymore with a toothbrush."

"And this thing can wash cleaner than willow branches and cloth."

Su Mu was also very happy, "Now it's just a toothbrush, when the time comes I'll make toothpaste as well, it will be even better to use a set!"

"Oh! Good, that's great!" Su Dingguo looked at Su Mu with kind and gratified eyes.

"So what materials are needed to make toothpaste? Your father and I will help you prepare them?" Wang said.

“That would require a lot of materials!”

"The process of making toothpaste is much more complicated than that of making toothbrush."

"Hahaha, let's all help!" Everyone listened to Su Mu's words and looked at him with a smile.

Su Mu smiled playfully, "Then I will serve you without hesitation!"

Everyone looked at Su Mu like this and couldn't help but smile.

"Dad, please prepare some bamboo and bamboo leaves for me. Also some mint, wood ash, and clay. As for the rest, we can buy them at the store after we sell the cold noodles!"

"Okay, then you must be careful when you go out."

And so began another day of selling cold noodles to make money.

Because yesterday’s cold noodles were not sold enough, my mother made a lot more cold noodles today.

Familiar place, familiar stall.

"Come, take a look! You won't suffer any loss or be cheated with 15 cents!"

When people shopping hear the familiar shouts, they know that the stall selling cold noodles has arrived.

"Stall owner, give me two servings of cold noodles! I didn't get to eat it yesterday, but I'm the first one here today."

"Okay! I'll let you try it today. I guarantee you'll like it."

A familiar long line began to form among the crowd.

The familiar man was still sitting on the second floor diagonally opposite.

The people dressed as guards around the man thought, this master has been sitting here for an hour and hasn't eaten anything. What is he doing?

The man took a look at the new stall downstairs, stood up and walked downstairs.

"Master!" The guard hurried over.

"Master wants to eat cold noodles, I'll go buy it for you."

The man glanced at the guard, and the guard understood that the master wanted to go by himself.

The two walked towards the stall one after the other.

The man walked up to the stall and saw that the woman there had a slender figure, an oval face, a pair of sparkling eyes under her curved eyebrows, and a bright smile on her face.

"Girl, give me ten servings of cold noodles."

When Su Mu heard someone asking for cold noodles, he suddenly turned his head and looked at the person who came.

The moment their eyes met, Su Mu thought, wow, this guy is so good-looking!

Her nose is like a hanging beam, her lips are red, her skin is as white as cream, and she has a slender figure, broad shoulders and a narrow waist.

"Sir, are you sure you want ten servings of cold noodles?"

"Yes, there are many people in my family." The man smiled.

"Okay, I'll prepare it for you." This man's smile is really enchanting!

Su Mu turned around to prepare the cold noodles. Although this person was good-looking, he had nothing to do with him and was not as important as the ten servings of cold noodles in his hand.

Su Mu handed him the prepared cold noodles and said, "Sir, take care."

The man walked back to the teahouse, kept a portion of the cold noodles for himself, and ordered the rest, "Give this to father, mother, and eldest brother to try."

"Yes!" The guard turned and went out.

Today's cold noodles were sold out very quickly, and we prepared a hundred more, making a total of three hundred, which were sold out in a few hours.

Su Mu went to the drugstore to purchase chicken's gizzard lining, one of the items needed for toothpaste. Chicken's gizzard lining is the yellow inner membrane peeled off from the inside of the chicken gizzard.

He went to purchase flour and a series of other things, and drove the donkey cart back home.

When I got home, I saw my father burning wood ashes.

"Mumu, you've been tired all day. Take a rest and we'll do it tomorrow." said Old Man Su.

"It's okay, just prepare everything today."

"First, grind the coarse salt into fine powder, then grind the chicken's gizzard lining into fine powder, and cut the bamboo leaves into small pieces."

The second brother was helping to apply coarse salt, the eldest brother was beating the chicken gizzard lining, and mother was cutting bamboo leaves.

Mix the three ingredients, stir evenly, put them into a bamboo tube, and leave them overnight.

The next day, seal the bamboo tube with clay and put it in the fire until it is baked into ash. Take it out, break it into pieces, and grind it into powder for later use. Grind the bamboo charcoal and mint into powder and pour it into the fire.

Prepare wood ash, put it into water and stir evenly, then filter it with cloth to get alkaline water.

Pour the alkaline water into the mixed powder prepared earlier, stir evenly and the toothpaste is ready. If conditions permit, you can also add pearl powder.

Looking at the black paste, I asked, "Is this toothpaste?"

"Let me try!" the third brother said enthusiastically.

He took his small toothbrush, dipped it in some toothpaste, and started brushing his teeth.

Everyone looked at him expectantly as he brushed his teeth and rinsed his mouth with water.

"how is it going!"

“Hahahahahaha so cool!”

"My teeth feel so clean and cool. They are the cleanest I have ever felt."

"Mint is added to it, so it's very refreshing." Su Mu said with a smile.

"Let's try it too!" The eldest brother and the second brother were also eager to try.

"It feels cool after brushing my teeth with this thing!"

So everyone brushed their teeth again with toothpaste, and after brushing they all stood there with their teeth bared and grinning.

Su Dingguo couldn't help but laugh when he saw everyone like this.

"It's great that Mumu is back."

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