This article is very likely to throw your belief system regarding face firming creams upside down - at least, or especially, regarding the connotated risks. If you use common sense, would you, without doing any research whatsoever, say that cancer's a possible consequence of choosing the wrong one..? It is. Therefore, it's not only a plus, to choose the right face-cream, but way more important.
Ironically, you will be best off - when it comes to choosing the optimal face firming creams - by going by your common sense (which, if you thought cancer's not a potential consequence of choosing the wrong one, didn't exactly help you just a few minutes ago). Instead of looking for something miraculous, ask yourself what would be best for you. Cancer's what? It's unnatural, right? It's something unnatural. When aiming to pick out the optimal face-cream, you should always ask yourself "what is most natural, here?". Have naturalness as, kind of, your guiding light. You don't want to put bandaids on a bleeding wound - like botox would probably be a good example of a product that does. You want to find things that are always nutritious - whether that be in something that you eat, or whatever. In other words, if the product's antioxidant-rich, it's good. Mineral-rich is a good thing. Anything that heals, is obviously good. Any ingredient that you would ASSUME is good for you, is very likely to be good (and if you're unsure, just ask someone or research it).
What would you say is one of the most important things in building muscles? Proteins are. ...And is your skin's going to be helped by a firming-product rich in those? Sure. Also, Vitamin-A, will help your body's production of proteins - so having that in face firming creams is a good thing. Vitamin-E is one of the best antioxidant - so look if that one's in it, too.
Would you say a chemical's to be preferred, when it comes to something being natural? Of course not, so stay away if a product's full of those (and, even better, stay away from any at all).

Hopefully, this has enlightened you somewhat on the subject of face firming creams - and will help you stay away from spending money on things that only irritates your body's biggest organ, or even causes a disease to come in it.