If an article is alleged to be misbranded because the labeling is misleading, or if an advertisement is alleged to be false because it is misleading, in determining whether the labeling or advertisement is misleading, there shall be taken into account among other things representations made or suggested by statement, word, design, device, sound, or combination of them, and the extent to which the labeling or advertisement fails to reveal facts material in the light of the representations or material with respect to consequences that may result from the use of the article to which the labeling or advertisement relates under the conditions of use prescribed in the labeling or advertisement or under customary or usual conditions of use.