12-year-old children cusp teeth replaced and lost, need to pay attention to a reasonable diet, oral hygiene, and timely set teeth. 1. Reasonable diet: after the loss of permanent teeth is easy to cause tooth loss, in a short period of time, try not to eat particularly hard food, so as not to damage the gum tissue, as well as the surrounding teeth. 2. Oral hygiene: pay attention to oral hygiene after tooth loss, and insist on brushing in the morning and evening, which can reduce the formation of caries and prevent secondary infection. 3. Timely set teeth: after the loss of permanent teeth, missing teeth will affect normal chewing, so it is generally recommended to set teeth in a timely manner. If you don’t fill the teeth for a long time, the distance between neighboring teeth will be gradually narrowed, which will easily affect the aesthetics of the teeth as well as the chewing function. 12-year-old children need to pay attention to the above points after the loss of permanent teeth, usually also need to protect the teeth, to avoid accidental injury caused by tooth loss. For children who need to fill the teeth, it is recommended to go to the hospital to take dental radiographs to understand the situation of missing teeth, once found that there is residual tissue, need to be extracted in a timely manner.