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Real-world sequential decision-making tasks are generally complex, requiring trade-offs between multiple, often conflicting, objectives. Despite this, the majority of research in reinforcement learning and decision-theoretic planning either assumes only a single objective, or that multiple objectives can be adequately handled via a simple linear combination. Such approaches may oversimplify the underlying problem and hence produce suboptimal results. This paper serves as a guide to the application of multi-objective methods to difficult problems, and is aimed at researchers who are already familiar with single-objective reinforcement learning and planning methods who wish to adopt a multi-objective perspective on their research, as well as practitioners who encounter multi-objective decision problems in practice. It identifies the factors that may influence the nature of the desired solution, and illustrates by example how these influence the design of multi-objective decision-making systems for complex problems.

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Phytotherapy studies the use of plants with therapeutic potential, derived from popular knowledge, which is passed down from generation to generation, is considered an alternative to medical and dental treatment. The present study aimed to review the literature on the use of herbal remedies aloe vera, calendula, chamomile, copaiba, malva, papain, penicillin, propolis, pomegranate and tansage, relating popular use with the scientific evidence in dentistry. We searched for articles in the databases of Scielo and Pubmed using phytotherapy, medicinal plants and dentistry, published between 2005 and 2015, which were grouped according to the medicinal plant. All the plants studied presented therapeutic potential and application in dentistry. The antibacterial potential was identified in aloe vera, calendula, copaiba, papain, propolis, pomegranate and tansagem, the healing action is present with the use of aloe vera, calendula, papain and propolis and analgesic with camomile, copaiba, malva and penicillin, besides of them all had anti-inflammatory power. Therefore, these phytotherapics should be considered as an alternative in the treatment of oral diseases because they present properties that aim to improve the signs and symptoms present in the oral cavity during pathological processes, with easy access.

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