The fee for changing one's mouth is a traditional custom of marriage in China, so there is no specific provision. Generally speaking, the change fee depends on the economic conditions of the woman's family. Moreover, the two families can communicate and negotiate before the wedding, and the amount should be the same, so don't be unbalanced.
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It's best to prepare a red envelope in advance, wrap it in red and write a happy word, which is both auspicious and attractive. Generally, a parent prepares two red envelopes, and after the exchange, a parent gives one to the new couple.
Newcomers should drink tea to their parents. Don't just remember to change your mouth and accept red envelopes. You should also carefully understand the manners, gestures and attitudes of tea worship. Pay attention to the etiquette of receiving red envelopes.
When giving tea to the man's parents, the groom usually gives tea to his father first, and then the mother and bride are renamed as parents-in-law in the order of the groom's tea.
When giving tea to the woman's parents, the bride gives her father the first cup of tea, and then the mother and groom change their names to their parents-in-law in the order of the bride's tea. Newcomers receive red envelopes after offering tea. Be respectful. They must accept the red envelope with both hands and express their gratitude to their parents.