Most people assume that decay has no escape, that yes or yes, although you brush your teeth, you end up having some, and in fact it is not. Caries is the most common bacterial disease worldwide, and yet it is not very difficult to prevent, today we will talk about how to do it. As dental caries is a multifactorial disease, sufficient predisposing factors must be present in order to manifest the disease. The predisposing factors of tooth decay are food, hygiene, genetic predisposition, oral pH, cultural and socioeconomic level, and the most important: the contagion of Streptococcus mutans – one of the bacterial agents that cause tooth decay. If all the factors converge but there has been no contagion, the disease can not occur, so it is important to avoid contagion as far as possible – or at least delay it to the maximum, when we talk about young children. Likewise, we must always control most of the rest, such as having a good diet, good hygiene, and interdental hygiene, as well as avoiding shared eating with a baby, avoiding blowing on your food to cool it, etc. Food must be balanced, low in refined carbohydrates, rich in essential vitamins and minerals. Brushing at least twice a day or after each meal with a toothpaste suited to the needs of the person is indispensable, as well as interdental cleaning with silk or dental tape, interproximal brushes or oral irrigators, which must be done daily. Likewise, it is recommended to go to the dental clinic every 6 months to detect early caries so that it can be stopped in time, before it progresses and causes cavitation in the tooth.