In the context of advertising, what does "don't believe a word that comes out of his mouth" suggest about the trustworthiness of the individual?

The phrase "don't believe a word that comes out of his mouth" indicates a strong skepticism toward the individual’s statements and implies that they are deceptive or unreliable. This expression is often used to suggest that the person has a history of lying, exaggerating, or otherwise failing to provide honest or credible information. Therefore, it characterizes the individual as untrustworthy. The language used signals that the audience should be very cautious and not take what the suspect individual says at face value. This phrase directly conveys a lack of confidence in the sincerity or truthfulness of the person, thereby categorizing them as someone whose assertions cannot be relied upon.