Growth hormone

https://ja.m.wikipedia.org/wiki/%E6%88%90%E9%95%B7%E3%83%9B%E3%83%AB%E3%83%A2%E3%83%B3#

https://kids.gakken.co.jp/kagaku/kagaku110/science0034/

https://kids.gakken.co.jp/kagaku/kagaku110/science0033/

https://sportsone.jp/nutrition/column/1254.html

https://www.ns-seikeigeka.com/qacolumn/seichouki/532.html

Ears

https://www.yokohama.kanagawa.med.or.jp/radio/2020/OA_0611-0618.html

https://www.veriteclinic.or.jp/column/post0088

https://www.jaisa.or.jp/action/group/bio/Technologies/Ear/Ear-f.htm

https://ribiyo-news.jp/?p=23810

https://www.stemcell.co.jp/column

Nerve

https://neurotech.jp/medical-information/repair-damaged-nerves/

https://www.inamura-clinic.com/knowledge/knowledge_saisei.html

Do tooth nerves grow back?

The nerve inside a tooth has very limited ability to heal itself or regenerate.

Source of these sentences are maybe from this website https://www.premierdentalohio.com/blog/root-canals

https://www.yujikai.com/2020/07/06/1262/