Do teeth always have to be extracted?

The term "chi ya" (tooth) here likely refers to wisdom teeth. Wisdom teeth do not necessarily have to be removed, but they are generally recommended for extraction to prevent potential oral health problems. Details are as follows:

Wisdom teeth are the third molars located at the very back of the dental arch in the human mouth. They serve no significant chewing function and have little physiological importance. The eruption of wisdom teeth is a normal physiological phenomenon. If a wisdom tooth erupts in a proper position and does not interfere with normal chewing or daily life, it may not need to be extracted. However, wisdom teeth are prone to inflammation, which can lead to symptoms such as swollen and painful gums, difficulty swallowing, and limited mouth opening. They may also negatively affect adjacent healthy teeth, causing misalignment of the dental arch, and increase the risk of dental caries. These complications can compromise overall oral health; therefore, extraction is usually advised. It is generally acceptable to wait until the wisdom tooth has fully erupted before removing it, but if inflammation occurs, earlier extraction is better.

In summary, while removal of wisdom teeth is not always mandatory, it is generally recommended to prevent future oral health issues. Wisdom tooth extraction should be performed at a reputable medical facility. Additionally, maintaining good oral hygiene through regular tooth brushing is important in daily life.