This question already has an answer here:
I've encountered the phrases "lying through his teeth" and "lying". Both have been used in similar contexts to (at least what I understand) as similar definitions. What is the meaning of the idiom of "to lie through one's teeth" and how is this different from just regular lying? Does lying through your teeth mean you lie while smiling?
Related, but not a duplicate. The answer there only tells the difference between "lying through his teeth vs lying in his teeth". My question is unique because I am asking about the difference in the usage of lying through his teeth vs lying in similar context, while the related question only addresses the origin of the phrase.