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Objective: Social media is a platform for sharing views on aspects of life, including oral health. This study aimed to characterize Facebook posts related to toothache information. Methods: Two independent investigators retrieved 500 English-language posts with the highest level of interaction using CrowdTangle™ and analyzed their facticity, motivation, author's profile, content, sentiment, and type of post. Data were analysed descriptively and using Pearson's Chi-square and Mann-Whitney U tests and multiple logistic regression models. Results: Most posts were produced by regular users and were not financially motivated, although commercial posts had significantly higher total interaction among users. While link- or video-containing posts (OR = 1.66) and posts with positive sentiments (OR = 1.53) were associated with users' total interaction, older (OR = 1.81) and link- or video-containing posts (OR = 2.04) were associated with overperforming scores. Misinformation was positively associated with financial motivation (OR = 2.03) and positive sentiments (OR = 3.79). Conclusion: This study highlights the importance of addressing the spread of misinformation related to oral health on social media and taking steps to ensure that accurate and reliable information is readily available. Toothache-related misinformation was associated with positive sentiments and financial motivation. Links, videos, and positive sentiments awakened greater user engagements with toothache-related posts. [ABSTRACT FROM AUTHOR]