With the improvement of social standards, parents are more and more concerned about their children’s dental conditions, and orthodontic treatment has gradually become well-known. However, parents have been very confused about the issue of tooth extraction and correction in orthodontic treatment. Many parents think that tooth extraction will lead to loosening of the teeth, or that the teeth will fall out easily when they get old in the future. I can only say that there has not been any basis or evidence to prove such views. It has been more than 100 years since orthodontic treatment of teeth has been utilized in clinical practice, and every day, many people are forced to have their teeth extracted in order to undergo orthodontic treatment. Therefore, we can think about it the other way around, if these patients who have their teeth extracted for orthodontic treatment will have all their other teeth loosened after treatment, then how can such an industry exist and even develop for more than a hundred years on earth, it should have died out long ago. Why is it necessary to extract teeth during orthodontic treatment? First of all, the “Origin of Species” tells us that the survival of the fittest. Therefore, in order to adapt to the environment and our living habits, our body structure will change with the environment, some parts will evolve, such as our brain, while some parts will degenerate, such as our jaws, our teeth. It’s said that gorillas are our closest relatives, and if you look closely, you’ll see that their jaws are very forward and very large. Because they need to chew on plant stems, branches, or raw meat, they need strong jaws and enough teeth to chew. Now we, on the other hand, we eat cooked meat, burnt rice, and we no longer have to eat bark or chew raw meat, so our jaws have deteriorated. But there is a law of degeneration and that is the harder the tissue the slower it degenerates, and teeth are much harder than bones, so the teeth degenerate much slower than the jaws, and the end result is that our jaws can’t hold as many teeth as they should, and so crowding of teeth occurs. Similarly, this is why in most cases, our wisdom teeth don’t grow. Because, we have too many teeth and our jaws don’t have enough. Let’s say, a room can only fit 28 people, but 32 people came, to fit these 32 people everyone can only squeeze. Therefore, in many patients’ orthodontic treatment, tooth extraction is inevitable because we really don’t need so many teeth to perform the chewing function. In closing, I hope this article has given you a new perspective on tooth extraction orthodontic treatment.