Fusion is defined as the partial or complete union of two or more teeth during their development; it can occur between normal teeth or between a normal tooth and a supernumerary tooth. This anomaly can be unilateral or bilateral and can affect any teeth, although deciduous teeth are more frequently damaged. It can also affect the patient’s appearance, cause changes in the dental arch space, lead to cavities and affect periodontal structures. This article presents the case of 13-year-old who came in for consultations due to repeated inflammatory events at the level of gum 22. These episodes stem from the fusion of tooth 22 with a supernumerary. After radiographic evaluation and adequate planning, the supernumerary tooth was extracted, and the palatal groove formed by the fusion of both teeth was eliminated, which had been the main cause of the patient’s periodontal-endodontic lesion.

Biofilm is a group of cells sticking together on a surface, embedded within a matrix of exopolysaccharides protecting them from antibiotics. Over 60% of microbial infections are caused by biofilms. The antimicrobial resistance increase of these communities involve several mechanisms, including: inactivation of antibiotics through extracellular polymers, decline of the growth rate by nutrient limitation and phenotypic changes in the bacterial cells, as a result of the resistant gene acquisition within the biofilm. Prognosis for treatment and eradication of biofilms is not the best one. The development of new medicines becomes necessary and urgent to counter biofilm related infections. This post shows the case of a 44 year old woman who goes to see the doctor for pain in 12, particularly upon vertical percussion. Such episodes are caused by under extended endodontics of 12 and in the extraradicular filling material of ducts. After the x-ray evaluation and appropriate application of the treatment plan, spherical shaped bacteria were detected within the biofilm, which caused the patient’s infection.