For example, if you don't get well after several courses of treatment, you need to lose money, but the other party says that your skin problem has nothing to do with them, so it is not good to indicate in the contract how many courses you need for this kind of skin to save money.
You'd better negotiate first, then print two copies outside, write the blank below at the end of the article, and then sign and seal the beauty salon in duplicate, both of which are originals, regardless of the original copy. If someone wants to add holidays or modify the original contract, it is not allowed to change, just add a supplementary agreement as an annex to the contract.