I'm a firm believer that if you want surgery/Botox/ fillers etc it's your money your body do as you please. I do think though, that if you are being paid to advertise make up or skin care products then it should be disclosed on the advert. Why should advertising these things be any different to a diet type food being sold saying it can only help as part if a calorie controlled diet. No that I think the strap line of, Sorry love but it's going to take more than moisturiser to help that face, will catch on but you get my drift!
I agree in some ads don't they say if the model is wearing false lashes or hair extensions so why not the same if the model has had fillers or botox? Though all ads are airbrushed, photshopped etc so we are never going to get a true image of the model.