| Location of acupoints | Study | Acupoints |
| Lingual surface | Yu 2007 | Xinxue, pixue | Yuan 2020 | Juhou | Sublingual | Chen 2021 | Shengen | Hao 2017 | Jinjin, Yuye, beside REN23, above REN23 | He 2019 | Shengen, zuoliang, zhimai | Both lingual surface and sublingual | Pan 2016 | Juquan (Lingual surface); Haiquan (sublingual) | Zhao 2015 | Juquan (Lingual surface); wai jinjin, wai Yuye (sublingual) | Zhao 2018 | Lingual surface, tip, edge and root | Acupuncture operation | Study | Oblique stabbing into the tongue root | Chen 2021, Hao2017, He2019, Pan 2016, Yuan2 020, Zhao 2015 | Twisting the needle body after stabbing | Chen 2021, Hao 2017, He 2019, Pan 2016, Yu 2007 | Acupoints pricking | Hao 2017, He 2019, Zhao 2018, Zhhao 2015 | Number of operating methods | Study | One operation method | Yuan 2020, Zhao 2018, Yu 2007 | Two operation methods | Chen 2021, Pan 2016, Zhao 2015 | Three operation methods | Hao 2017, He 2019 |
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