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Teeth are the surplus of bones, and bones are connected to the meridians of the Kidney. In newborn infants, if there is duplication of the gums (Chongyin) or swelling of the sublingual caruncle (Chongzhi), it is because the bones fail to consolidate the marrow. Consequently, abnormal tissue grows inside the cheeks, resembling the membrane of a reed. It should be pricked slightly with a needle wrapped in cotton to drain blood and fluid. First, wash with light salt water, then frequently apply Xixin San (Asarum Powder).

The upper part of the teeth belongs to the Foot-Yangming Stomach Meridian, and the lower part belongs to the Hand-Yangming Large Intestine Meridian. Diseases of the teeth are mostly attributed to the Stomach, but the injury may differ between Stomach Blood and Stomach Qi. When Stomach Blood is injured, the patient prefers cold and dislikes heat; Qingwei Tang (Clear the Stomach Decoction) is used. When Stomach Qi is injured, the patient prefers heat and dislikes cold; Yiwei Tang (Benefit the Stomach Decoction) is used.

Ye Xihou stated: Patients with Stomach disease have extremely foul breath, whereas those with Kidney disease do not.

When children sleep with their mouths open facing the wind, they inhale Wind Pathogens that linger unresolved, causing soreness and pain in the tooth gaps. This is treated with Hutonglei Tang (Poplar Gum Decoction). If Stomach deficiency leads to excessive damp-heat stagnation that cannot descend, resulting in swollen and painful teeth, Qingwei Tang combined with Wuling San (Five-Ingredient Powder with Poria) [see Mouth section] is used. For cases of gingival ulcers (Yagan) with bleeding, foul breath, and rotting flesh, Lushui Wan (Aloe Pill) [see Gan accumulation section] is used.

Children with congenital weakness and timidity may experience intermittent toothache after several years of age, suffering from Chonggan Fenghou (a pediatric condition characterized by tooth decay and pain due to wind). Jiwei Dihuang Wan (Nine-Ingredient Rehmannia Pill) is the primary treatment. Due to insufficient Kidney Qi and unfilled marrow channels, teeth may fail to erupt at seven or eight months, or erupt weakly with difficulty chewing. Xiong Qusan (Ligusticum Powder) is used for this.

Xixin San (Asarum Powder): Treats all types of wind-induced toothache caused by dental caries, along with swelling of the cheeks and jaw.

Formula Composition: Asarum (Xixin) and Schizonepeta Spike (Jingjie Sui) (1 liang each); Amomum Fruit (Sharen), Long Pepper Fruit (Bibo), Pyrethrum Root (Heshi), and Gleditsia Sinensis Pod (Zaojiao) (5 qian each); Angelica Dahurica (Baizhi), Piper Longum (Xijiao), and Aconite Root (Caowu) (2 qian each). Grind into powder, apply to the affected area. Spit out saliva if produced, and rinse with water.

Qingwei Tang (Clear the Stomach Decoction): Angelica Sinensis (Danggui), Rehmannia Root (Shengdi), Moutan Bark (Danpi), Cimicifuga Rhizome (Shengma), Licorice Root (Gancao), Forsythia Fruit (Lianqiao), Coptis Rhizome (Huanglian).

Yiwei Tang (Benefit the Stomach Decoction): Angelica Sinensis (Danggui), Poria (Fuling), Atractylodes Macrocephala Rhizome (Baizhu), Tangerine Peel (Chenpi), Astragalus Root (Huangqi), Licorice Root (Gancao), Saposhnikovia Root (Fangfeng), Cimicifuga Rhizome (Shengma).

Jiwei Dihuang Wan (Nine-Ingredient Rehmannia Pill): Rehmannia Root (Shengdi), Cornus Fruit (Shanyuzhu), Dioscorea Rhizome (Shanyao), Moutan Bark (Danpi), Poria (Fuling), Angelica Sinensis (Danggui), Ligusticum Rhizome (Chuanxiong), Quisqualis Fruit (Shijunzi), Toosendan Fruit (Chuanlianrou).

Gao Gufeng stated: This formula directly drains the Wind-Wood of the Jueyin meridian, representing a method of treating the Kidney and Liver simultaneously. Since Chonggan arises from the transformation of Wind-Wood, there is a rationale for purging it. However, purging the "son" (Liver/Wood) harms the "mother" (Kidney/Water), so five ingredients are used to tonify. Ze Xie (Alisma Rhizome) is omitted because the Kidney should not be drained further.

Hutonglei Tang (Poplar Gum Decoction): Angelica Dahurica (Baizhi), Ophiopogon Tuber (Maidong), Angelica Sinensis (Danggui), Rehmannia Root (Shengdi), Trichosanthes Root (Huafen), Gypsum (Shigao), Asarum (Xixin), Cimicifuga Rhizome (Shengma), Kudzu Root (Gegen), Poplar Gum (Hutonglei).

Xiong Qusan (Ligusticum Powder): Ligusticum Rhizome (Chuanxiong), Rehmannia Root (Shengdi), Dioscorea Rhizome (Shanyao), Peony Root (Shaoyao), Angelica Sinensis (Danggui), Licorice Root (Gancao).

Grind into powder. Take 2 qian per dose, washed down with plain boiled water.