The overflow of secretion from the bottom of the root of the tooth may be caused by chronic apical periodontitis, root fracture, advanced periodontitis, etc. It is not necessarily curable, depending on the specific situation. 1. Chronic apical periodontitis: a large amount of inflammatory secretion will appear in the apical area of chronic apical periodontitis, which will overflow after the formation of pus. If the root of the tooth is not resorbed, the symptom of overflowing pus from the root of the tooth will disappear after root canal treatment. 2. Root fracture caused by dental trauma: root fracture caused by dental trauma will cause pus overflow from the root base of the tooth, which is of little significance to retain the tooth, and it is better to extract the tooth. 3. Advanced periodontitis: In advanced periodontitis, there will be loosening of the teeth, overflow of pus from the roots, etc. At this time, the alveolar bone resorption is more serious, and there is little significance in retaining the teeth, so it is only possible to remove the teeth first, and then carry out the comprehensive treatment of periodontitis. The bottom of the tooth root overflow secretion, it is best to go to the hospital in a timely manner, after the cause is clear and active treatment, in order to avoid delaying the condition.