There are no strict criteria for the best time to extract a tooth in children. Extractions can usually be performed at any time of the day without affecting the outcome of the treatment. First of all, the best time for extraction in children is when the permanent teeth start to erupt and the baby teeth become loose. If the baby teeth are not extracted in time, the permanent teeth may grow out of place and cause secondary symptoms such as malocclusion, limited chewing function and recurrent inflammation. Secondly, if a child has severe decay of the baby tooth or injury to the pulp nerve, it should be considered for extraction. Finally, if the child is in good physical condition, extraction is suitable at any time of the day. If there is oral inflammation, anti-infective treatment can be performed before tooth extraction treatment. Parents of children with developing teeth need to keep an eye on the growth of the baby teeth and permanent teeth. Good habits such as brushing teeth in the morning and evening and rinsing mouth after meals are helpful for the normal development and growth of teeth.