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*Weisheng Baojian* records: To treat pediatric nocturnal blindness (night blindness), moxibustion is applied at a point one cun posterior to the nail of the thumb, on the transverse white fleshy margin. One moxa cone, sized like a wheat grain, is used.

To treat pediatric gan eye disease (ocular lesions caused by malnutrition or parasites), two points of Hegu (LI4) are selected for moxibustion, one Zhu (moxa cone) per point. The moxa cone should be sized like a wheat grain. The acupoint is located in the depression between the first and second metacarpal bones of the hand.

For detailed moxibustion methods, please refer to *Zisheng Jing* and other classics; they are not reproduced here.

Li Dongyuan stated: Teeth are the external manifestation of the Kidney, and the mouth is the orifice of the Spleen. Many meridians converge at the mouth, including those associated with the teeth. The Hand-Yangming and Foot-Yangming meridians pass through the upper gingiva, which belongs to Kun Earth, specifically linked to the Foot-Yangming Stomach Meridian, which penetrates and connects here, remaining relatively static. The lower gingiva moves continuously during mastication, connected by the Hand-Yangming Large Intestine Meridian. The Hand-Yangming Large Intestine Meridian dislikes cold drinks and prefers heat, whereas the Foot-Yangming Stomach Meridian prefers cold drinks and dislikes heat. Their pathologies differ. Teeth are the external manifestation of the Kidney and also favor cold, as coldness ensures firmness. Pathological conditions differ from heat patterns. When heat is severe, it causes tooth mobility, gingival rupture and detachment, and unceasing pain; thus, treatments vary. Some patients experience pain due to aversion to cold, some due to aversion to heat, some due to both, some due to aversion to cold but preference for small amounts of hot drinks and large amounts of warm drinks causing pain, some due to aversion to heat but preference for small amounts of cold drinks and large amounts of cold drinks causing pain, some due to tooth mobility causing pain, some due to gingival recession causing pain, some due to gingival erosion by gan worms leading to defects, bleeding, and pain, some due to gingival swelling causing pain, some due to wind pathogens in the Spleen and Stomach causing pain upon feeling wind, some due to teeth being eroded by worms leading to defects and discoloration (worm toothache), some due to deficient Stomach Qi failing to resist cold exposure causing pain, and some due to toothache accompanied by foul odor that is unbearable. Since pains are so diverse, how can one medicine cure them all?

Note: This discussion indicates that tooth pain due to aversion to cold or heat primarily relates to the Hand and Foot Yangming meridians, while tooth mobility and gingival detachment primarily relate to the Foot-Shaoyin Kidney meridian; hence, these three meridians account for most cases. However, gingival recession, worm erosion, damp-heat, gingival swelling, bleeding pain, and painful foul odor are all caused by excessive Stomach fire. There are also mixed pathogens from various meridians and external factors. Therefore, the above pathogenesis and symptoms are described in detail. Students should investigate the mechanisms and treat accordingly.

Chen Wuyue stated: Teeth act as the gate of the mouth, reflecting the prosperity of the Kidney, and are the surplus of bone essence. When Kidney essence declines, teeth become loose; when essence is solid, teeth are firm. Additionally, collateral branches of the Large Intestine reside in the gingiva, mainly responsible for nourishing the teeth. When the Large Intestine is obstructed, teeth float; when deficient, teeth expose. If complicated by wind, it attacks the eyes; if gan disease affects the head and face, it leads to caries and tooth loss, potentially forming hemorrhoids. These are all manifestations arising from Qi stagnation, varying in presentation and requiring careful differentiation in treatment.

Carefully noted: Toothache caused by external invasion of wind-cold on the head and face, or inhalation of cold air through the mouth, belongs to external causes. Those caused by excess heat, Yin deficiency with fire hyperactivity, bone-steaming consumption, Qi stagnation, blood heat, or worm infestation belong to internal causes. Those caused by physical support, trauma, or striking belong to neither-internal-nor-external causes. Thus, different syndromes require different treatments. Chen Wuyue only mentioned meridian diseases without detailing the Three Causes classification; this was likely omitted during the copying or printing process.