EcoSmile is an innovative Portuguese product of quercitrin, an antioxidant extracted from kiwi branches residues with the objective of promoting circular economy. Since periodontal disease currently affects 20 to 50% of the world's population, there is a need for an efficient product to treat this condition. This antioxidant can be used as an active ingredient of this mouthwash as it has anti-inflammatory characteristics and repairs gingival tissues.The extraction and manufacturing processes were studied and scaled to an industrial level. The plant would be installed in Felgueiras, and a team of 14 workers was considered. An economic assessment was made, finding that an investment of €2,550,000 would be necessary. The project is economically viable and capable of generating a financial surplus.