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The entire tooth must be replaced in the socket as soon as possible, ideally in less than 30 minutes. However, teeth that have been knocked out have been successfully replaced up to 60 minutes later.
Human teeth mechanically break down food by cutting and crushing it in preparation for swallowing and digesting. As such, they are classified as a component of the human digestive system. Humans have four types of teeth, each with a specific function: incisors, canines, premolars, and molars. The incisors slice the food, the canines tear it, and the molars and premolars crush it.
Gums cover the teeth roots, which are embedded in the maxilla (upper jaw) or the mandible (lower jaw). Teeth are made up of a variety of tissues that vary in density and hardness.
Humans, like the majority of other mammals, are diphyodont, which means they have two sets of teeth. The first set, deciduous teeth, also known as "primary teeth," "baby teeth," or "milk teeth," typically contains 20 teeth. Around six months of age, primary teeth begin to appear ("erupt"), which can be distracting and/or painful for the infant. Some babies are born with one or more visible teeth, which are known as neonatal teeth or "natal teeth."
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