Legally:

What you said is not relevant. It does not matter if we know that they know that we know, something something. In law, it doesn't matter. Psychologically, we may lose faith in humanity if everyone is crying wolf and there is no wolf. People can begin not to trust people. But legally speaking it doesn't matter.

Disclaimer

People put out disclaimers. It is kind of like a trend. I'm not saying that people should but people do and I understand the motivation behind disclaimers. You might be right but many things in life is paradoxical. Life is a contradiction. Well, not actually but only from limited perception perspective.

Nothing Something

You can say nothing when you say nothing in the sense that the something is no more valuable than nothing and therefore should be classified as nothing.

Unwritten

What you did was good. If she had no evidence, then she probably would have lost her case, right or wrong, she would have been unable to prove her case. So, I would have told her that she must have enough evidence. She should not focus too much on hearsay or whatever as that becomes her word against theirs.

Suits

One of my favorite shows is called Suits. So, some of what I know about courtrooms come from nine years of watching that television show.

Disclaimer

If the salesperson said there are no guarantees, no promises, that the hair removal will be permanent, then that is a disclaimer, and they would use that in a court of law and would most likely win thanks to that. Things would be different if they were to constantly say that the hair will not grow back ever again no matter what. Well, you don't have to call it a disclaimer. It could be called the fine print which is usually written very small.

Marketing

You asked me a question. There are pros and cons between the different ways we can advertise. There can be risk involved. In some cases, liability perhaps. Legally speaking, there is the example of the person who sued I believe McDonald's many years ago because the person spilled hot coffee onto them. So, they went to court and the person won. After that, McDonald's would put a disclaimer on their coffee cups that says it is hot.

Fine Print

Many times, people end up taking other people to court. They sue them. All kinds of things happens. People go to court way too often. So, I don't like it but I know that it happens. So, I encourage people to be careful. What a person should do depends on a few factors.

Promises

To answer your question, a seller doesn't have to say he or she may not keep their promises, assuming that they made promises. Sellers should avoid making promises in the first place or simple say it can happen.

Hair Removal

As a seller, I would say that it can remove hair. I would use the word can and not will. Also, I would add that it can or may stop hair growth permanently and/or temporarily, possibly, to some extent, sometimes, for some people.

Playing Dumb

People sometimes play dumb, the sellers, buyers, etc, to various degrees. But at the same time, not always and not completely.... but yes, we all should learn to laugh at our own stupidity from time to time. In high school, I may have tripped on my shoelaces or whatever. I remember choosing to laugh at myself and to move on. Learn from mistakes and carry on. Yeah, art is in the eye of the beholder.

Long Nose

I have not heard of the expression of the long nose. Perhaps, what you are saying has something to do with blaming your faults on his. Is long nose a reference to Pinocchio?

You

Yeah, that is lawyer talk. When you say you, you don't mean me or just me but anybody reading. I do that too.