Objective: Evaluate microhardness and color stability of the composite resin Charisma (Heraeus-Kulzer) shade SL (ChSL). Methods: Fifty-three specimens with 5mm in diameter and 2mm in high were built on a metallic mold and polymerized by a light-curing unit (Curing Light 2500/3M-ESPE, 775 mW/cm2) for 40 seconds. Five specimens were submitted to a digital microhardness tester (MMT-3/Buehler), using a charge of 50gf during 30 seconds, making four indentations on the top (T) and bottom (B) surfaces (eight for each sample). Forty-eight specimens were exposed to water (control), coffee, tea and red wine solutions for seven days and stored in controlled temperature (37ºC). The samples were analyzed three times (1h, 24h and 7 days) by two evaluators working double-blinded. Results: Paired t-test (microhardness) and Kruskal-Wallis test (color stability) were used to analyze the data. There were no statistic differences between B and T microhardness, with polymerization efficiency being about 91%. Wine and coffee solutions showed worse pigmentation than the tea solution, although there was no difference between them (p>0,05). Conclusion: It was concluded that the tested polymerization unit is efficient in polymerizing ChSL, although all the solutions were able to stain the resin while the 7 days time showed the worse results.

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