• Another deceptive ad practice: vague language and statements that are contradictory to other statements in the same ad. ("Guarantee—all sales final").Disclosures that flatly contradict a deceptive claim, or that purport not to make the claim, are generally ineffective. Learn about the many types of deceptions involved in false advertising, including deceptive descriptions, prices, quantities, comparisons, and warranties. Advertising claims fall under the regulation of the FTC Act and state consumer protection laws. Learn how to avoid liability with product or service claims! This article will provide a general formula for writing ads with puffery that are legal to help you avoid a costly lawsuit for false advertising. An advertisement can be viewed as misleading if it fails to disclose material, relevant information or suggests something about a product that is not true. Make false claims; Advertise products that are not available; Misrepresent items or services in any way. False advertisement is untrue or misleading information given to you to get you to buy something, or to come visit their store.