The purpose of the study was to evaluate the force loss of orthodontic elastomeric chains with NiTi closed spring in artificial saliva by time. Methods. The study samples comprised 40 elastomeric chains (20 Dentaurum, and 20 G & H) and 15 NiTi closed spring (GAC). The elastomeric chains were submerged in 36,6 ºC artificial saliva and stretched on the instrument of resin plates at a distance of 30 mm. With an electronic dynamometer the delivered force was evaluated at different intervals: at baseline, after 1 day, 4, 7, 14, 21 and 28 days. Specimens of 15 NiTi coil springs were tested by dynamometer to evaluate force loss following 1, 2, or 3 months of use. Results. It was observed a significant force loss of elastomeric chains after 24 hours. There was a force loss of elastomeric chains (from 34±1.3% to 53.86±2% after 28 days of activation). NiTi springs showed force loss (~13%) following 28 days of use, with a further significant loss (~6%) at 4—8 weeks; force levels remained steady thereafter. Conclusions. There was higher force loss in the different commercially elastomeric chains (~60%) in comparison to NiTi springs (21%).