Angelica dahurica can be used to relieve toothache in the following ways. One common method is to make a decoction. Boil a proper amount of Angelica dahurica in water. After boiling, let it simmer for a while. Then, cool the decoction to a suitable temperature and use it to rinse the mouth. The active ingredients in Angelica dahurica have certain anti - inflammatory and analgesic effects, which can help reduce the inflammation around the teeth and relieve pain. Another way is to grind Angelica dahurica into powder and mix it with a little water to form a paste. Then apply the paste directly to the affected area outside the gums or cheek near the painful tooth. But it's important to note that these are just traditional remedies and if the toothache persists or gets worse, it's necessary to see a dentist for professional treatment.