Resumo
Objective: To discuss what is most important in Restorative Dentistry: using the best light-curing unit or using the best resin on the market. Methodology: During the construction of this narrative review article, it was necessary to create a methodological strategy that would meet the article's need to have the maximum amount of current and relevant information on the topic. Thus, searches were made in the following databases: DeCs, BVS/BIREME, Scielo, PUBMED Central, Science Direct, Web of Science, The Cochrane Library in conjunction with Google Academy. Results: Studies and clinical evidence show that there is no point in having the best resin on the market in your daily clinical practice if the photoactivation is not good, causing the resin not to last if it would have if it had had better photoactivation. Thus, it is understood that it is better to use the best light-curing unit on a resin that is not so good than to use the best resin, but that will be activated by a photocuring unit that is not good. Conclusion: Studies show that even if a resin is not the best on the market, if it is activated with a good light-curing unit, it will have more durability and performance than a resin that is the best on the market but is activated by a light-curing unit that is not good. Therefore, the best option would be to use the best resin and light-curing unit on the market, thus enhancing the durability and performance of the resin.