MOUTH, TONGUE, TEETH, GUMS, LIPS, PALATE AND PHILTRUM
MOUTH
Mouth ulcers
Observation, Chapter 8; Interrogation, Chapter 35
Stomach and Spleen-Qi deficiency with Yin Fire
These ulcers are due to Yin Fire as described by Li Dong Yuan in his ‘Discussion on Stomach and Spleen’ (see Chapter 55).
Cold sores
Observation, Chapter 8; Interrogation, Chapter 35
Stomach-Yin deficiency with Empty-Heat
Cold sores at the corner of the mouth or on the edge of the lower lip, dry mouth in the evening, dull or burning epigastric pain, a feeling of heat in the afternoon, thirst with a desire to drink in small sips, dry stools, a slight feeling of fullness after eating, night sweating, five-palm heat, bleeding gums, Red tongue (or Red centre only) without coating in the centre, Floating-Empty and Rapid pulse.
Cracked corners of the mouth
Itching around the mouth
Dribbling from the corners of the mouth
Stomach and Spleen-Heat
This dribbling is due to Stomach-Heat flaring upwards causing the fluids in the mouth to evaporate.
Trembling mouth
Liver-Blood and Liver-Yin deficiency with internal Wind 
The tongue and pulse presentation depends on whether Blood or Yin deficiency predominates.
TONGUE
The tongue signs discussed in this chapter deal only with a few unusual tongue signs; tongue diagnosis itself is discussed in full in Chapters 23–27.
Itchy tongue
Painful tongue
Heart-Yin deficiency with Empty-Heat
Slight pain of the tongue especially in the evening, dry mouth and throat, palpitations, insomnia, dream-disturbed sleep, poor memory, anxiety, tendency to be easily startled, mental restlessness, uneasiness, ‘feeling hot and bothered’, dry mouth and throat, thirst with a desire to sip fluids, a feeling of heat in the evening, malar flush, night sweating, five-palm heat, Red tongue redder on the tip with no coating, Floating-Empty and Rapid pulse.
Numbness of the tongue
Tongue ulcers
Observation, Chapter 8; Interrogation, Chapter 35
Heart-Yin deficiency with Empty-Heat
Tongue ulcers with white rims, dry mouth and throat, palpitations, insomnia, dream-disturbed sleep, poor memory, anxiety, tendency to be easily startled, mental restlessness, uneasiness, ‘feeling hot and bothered’, thirst with a desire to sip fluids, a feeling of heat in the evening, malar flush, night sweating, five-palm heat, Red tongue redder on the tip with no coating, Floating-Empty and Rapid pulse.
TEETH
Toothache
Toothache obviously excludes causes such as abscesses or root canal problems.
Tooth cavities
Loose teeth
Kidney deficiency
Loose teeth, lower backache, dizziness, tinnitus, tiredness, pulse Weak on both Rear positions.
Other symptoms and signs depends on whether there is a Kidney-Yang or Kidney-Yin deficiency.
Grinding teeth
Retention of food 
Grinding of teeth in children, fullness, pain and distension of the epigastrium which are relieved by vomiting, nausea, vomiting of sour fluids, foul breath, sour regurgitation, belching, insomnia, loose stools or constipation, poor appetite, thick tongue coating, Full-Slippery pulse.
Yellow and dry teeth
GUMS
Inflamed gums
Observation, Chapter 8; Interrogation, Chapter 35
Bleeding gums
Observation, Chapter 8: Interrogation, Chapter 35
Receding gums
Observation, Chapter 8: Interrogation, Chapter 35
Gums oozing pus
LIPS
Pale lips
Red lips
Purple lips
Blood stasis
Other symptoms and signs depend on the organ involved, which may be the Liver or the Heart.
Severe Kidney-Yang deficiency with Empty-Cold
This is a severe deficiency of Kidney-Yang with internal Empty-Cold that leads to some Blood stasis; for this reason the complexion is dark rather than pale, as it should be in Yang deficiency.
Bluish-greenish lips
Dry or cracked lips
PALATE
PHILTRUM
Flat philtrum
Pale philtrum
Qi deficiency
Pale philtrum, tiredness, poor appetite, loose stools, weak voice, Pale tongue, Empty pulse.