BackgroundFluoride varnish (FV) is widely recommended for caries prevention in preschool children, despite its anticaries benefits being uncertain and modest. Dentists often report using clinical practice guidelines (CPGs) as a source of scientific information.AimTo identify and analyze recommendations for clinical practice on the use of FV for caries prevention in preschool children and to assess the methodological quality of the CPG on this topic.DesignTwo researchers independently used 12 search strategies and searched the first five pages of Google Search™ and three guideline databases for recommendations freely available to health professionals on the use of FV for caries prevention in preschoolers. Then, they retrieved and recorded recommendations that met the eligibility criteria and extracted the data. A third researcher resolved disagreements. Each included CPG was appraised using the AGREE II instrument.ResultsTwenty‐nine documents were included. Recommendations varied according to age, patients' caries risk, and application frequency. Of the six CPGs, only one scored above 70% in the AGREE II overall assessment.ConclusionRecommendations on the use of FV lacked scientific evidence, and CPGs were of poor quality. Application of FV is widely recommended despite recent evidence showing an uncertain, modest, and possibly not clinically relevant anticaries benefit. Dentists should be aware that it is necessary to critically appraise CPGs since they may be of poor quality.

Cavernous Sinus Thrombosis (CST) is an uncommon neurological infection that affects the cavernous sinus of the dura mater, which can lead to death. When untreated, odontogenic infections can cause CST, since facial veins do not have valves. The diagnosis consists of the clinical characteristics added to imaging exams such as computed tomography (CT) and magnetic resonance imaging (MRI). The effectiveness of antibiotic therapy in significantly reducing mortality has been proven, but therapy with anticoagulants and corticosteroids remains unknown in the literature. Objective: The purpose of the study is to make a literature review on etiology, paraphysiology, symptoms, complementary exams, diagnosis and outcome of patients who presented CST as a result of an odontogenic infection. Materials and methods: a literature review was carried out, using articles from the Pubmed, Lilacs and Cochrane databases, from the last 10 years in the English language and reference articles to complement. The Mesh terms used were 'Cavernous Sinus Thrombosis', 'Cavernous Sinus Thrombosis AND Odontogenic Infections' and 'Cavernous Sinus Thrombosis AND Dental Infection'. Conclusion: CST motivated by odontogenic infections is a rare but extremely dangerous disorder that must be discovered early in order for the patient's prognosis to be favorable. It is necessary to pay attention to the clinical signs and to the analysis of the imaging exams so that the differential diagnosis is made.