RT Book, Section A1 Murtagh AM, John SR Print(0) ID 1136024207 T1 Orodental Problems T2 Murtagh’s Practice Tips, 7e YR 2016 FD 2016 PB McGraw-Hill Education PP Sydney, Australia SN 9781743769300 LK murtagh.mhmedical.com/content.aspx?aid=1136024207 RD 2024/04/18 AB If a permanent (second) tooth is knocked out (i.e. in an accident or fight) but is intact, it can be saved by the following, immediate procedure. The tooth should not be out of the mouth for longer than 20 to 30 minutes from the time of injury.