In the past few years, glycine powder air polishing showed positive outcomes in removing subgingival biofilm in periodontal pockets, and subgingivally delivered metronidazole seemed to improve the results of scaling and root-planing alone . Recently, a new prophylactic powder has been developed. The special action of the powder is attributable to the new ingredient Erythritol and the extra-fine grains that measure only 14 microns. The small size results on one hand in a minimal impact per grain on the treated surface and on the other hand in a very dense jet of powder, efficient on biofilm.