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Strengthen teeth and benefit gums.
Bai Mian (Triticum aestivum Flour, white flour) (4 liang) Zao Jiao (Gleditsiae Sinensis Fructus, soap bean pod) (2 ting, unpeeled, chopped) He Zi (Terminalia chebulae Fructus, terminalia fruit) (1 liang) Yan (Salt) (1 liang)
Place the above ingredients together, wrap them in dough, and burn with Huai Zhi (Sophorae Tonkinensis Ramulus, pagoda tree branch) until the smoke is exhausted. Then add Sheng Ma (Cimicifugae Rhizoma, black cohosh rhizome) and Xi Xin (Asari Radix et Rhizoma, asarum root) each 1 liang, pound them together into powder. Brush teeth every morning, rinse mouth after a while.

Song says: A wild guest comes from the immortal realm, presenting a formula to change hair color. Collect XX grass in the south, take fresh ginger from Bing land, Tong Qi (Lacca), Zhu Ya Zao (Gleditsiae Sinensis Fructus, soap bean pod), Wu Ma (Sesami Fructus niger, black sesame) and Di Huang (Rehmanniae Radix, rehmannia root), Tu Si Zi (Cuscutae Semen, dodder seed), all seven flavors. Seal tightly and put into a porcelain jar, fire must burn for consecutive days, yellow turns black throughout the night. When the medicine is ready, use it to brush teeth, its efficacy is truly immeasurable. Not only will beard and hair turn black, but also longevity will be extended.
XX Cao (Herba of unknown southern plant) Sheng Jiang (Zingiberis Rhizoma Recens, fresh ginger) (sliced, baked dry) Tong Qi (Lacca) Wu Ma Zi (Sesami Fructus niger, black sesame seed) (if unavailable, Hu Ma Zi Sesami Fructus can substitute) Di Huang (Rehmanniae Radix, rehmannia root) Zhu Ya Zao Jiao (Gleditsiae Sinensis Fructus, soap bean pod) Tu Si Zi (Cuscutae Semen, dodder seed)
Each of the above 4 liang, put into a bottle, seal the neck with yellow mud, fire for one day, then bury in a cellar 3 chi 6 cun deep underground. Take out during the San Fu period (dog days of summer), store in a box, expose to dew for three nights, do not let sunlight touch it. Sieve into powder, use for teeth like toothpaste.

Sheng Gan Di Huang (Rehmanniae Radix Preparata, prepared rehmannia root) (choose good quality, cut finely, 12 fen) Sheng Ma (Cimicifugae Rhizoma, black cohosh rhizome) (1 liang, crushed) He Zi (Terminalia chebulae Fructus, terminalia fruit) (2 pieces, ground to powder) Bai Yan Hua (Halitum Salis, rock salt crystals) (0.5 fen) Ma You (Sesami Oleum, sesame oil) (powdered, mixed with Sha Niu Fen (Bovis Stercus, cow dung) to prevent splashing)
Mix the above ingredients evenly, store in a clean sand bottle, seal the mouth tightly, mud the entire body, dry in shade for 7-8 days. When the mud is dry, place in a furnace, surround the bottle with charcoal fire, continuously add charcoal until 7 jin are consumed. The medicine becomes black ash, collect it, grind finely into powder. Use morning and night to brush teeth. As per the following method, brushing teeth method: when using the medicine, take a piece of fresh ginger, size of an almond, chew thoroughly, spit out after a moment, keep the residue. Brush 3-5 times with left hand fingers. Moisten fingers, dip into powder, brush more than ten times. Do not spit out the juice. Use hands to gather saliva, apply to beard and hair. Wait for the spicy sensation to subside, then swallow slowly. This medicine also treats Jiao Feng (foot wind/erysipelas), Chang Feng (intestinal wind/hemorrhoids), descends qi, preserves youth, strengthens teeth. If used diligently, beard and hair will never turn white in a lifetime. Turns black in 100 days; reddish hair turns black in 50 days. Effects visible after 20 days of use. If used on an empty stomach three times, and again after meals, effects will be faster.