Objective: Determine the lip position influence on dental aesthetics in adults older than 19 years according to academic publications in the last 5 years. Material and methods: A systematic research was carried out in the medical literature (UNAM, Cochrane, BVS, Scielo, PubMed), using the following search strategy: (lip line) OR (smile line) AND (parameters) AND (analysis) AND (evaluation) to identify articles that reported data on lip position parameters that influence dental aesthetics. The results of each study were extracted and classified as follows: smile line or lip line, length of the lip with the smile line, gingival display, smile arc, smile type and upper lip curvature. Results: From the 4497 articles analyzed, 17 studies were selected for the final review process. Considering the studies in this literature review, the most frequent criteria are: a midline smile, a low gummy smile line, a consonant smile arc, a static smile, a commissural type of smile, and an upward curvature of the upper lip. Conclusions: An aesthetically attractive smile includes different parameters, among those that have a positive influence are a high or medium anterior smile line, a parallel smile arc, straight or upward upper lip curvature, type of commissural smile and a gingival exposure less than 2 mm.

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Among the most common problems in Dentistry is the accumulation of dental biofilm in the oral cavity and this is generally the precursor of various pathologies such as: cavities, gingivitis, halitosis etc. Which is why it has been dedicated to investigate the amount of biofilm accumulated by children from 5 to 10 years old. Objective: To establish specific results of the amount of dental biofilm that accumulates in teeth in children aged 5 to 10 years to avoid future oral alterations. Know the total percentage of biofilm on all dental surfaces. Determine the existing lack of hygiene. Identify which of the five ages taken has the greatest amount of biofilm. Materials and Methods: Inclusion, exclusion, sex, age, home location and the Löe and Silness plaque index were considered. Results: Prevalence according to sex: Male, Percentage of total biofilm: 1.19. Surface with the highest amount of biofilm: Vestibular, Prevalence according to age: 7.62 years. Conclusions: The analysis showed us that the amount of supragingival biofilm in children aged 5 to 10 years using the Löe and Silness index presents a high cariogenic risk (1.19%), especially those with an age of 7.62 years.