Has lemon balm been studied for teeth-grinding?

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Lemon balm has been minimally studied for teeth grinding; a 2016 trial in children showed no significant effects after 1 month of treatment. Overall, the research on its efficacy for this issue is not promising.

There is very little human research, and it is not promising. A single 2016 randomized controlled trial in children with sleep bruxism (grinding teeth while asleep) didn’t find any effect after a month of lemon balm tincture.[1]

References
1.^Bortoletto CC, Cordeiro da Silva F, Salgueiro Mda C, Motta LJ, Curiki LM, Mesquita-Ferarri RA, Fernandes KP, Bussadori SKEvaluation of electromyographic signals in children with bruxism before and after therapy with Melissa Officinalis L-a randomized controlled clinical trial.J Phys Ther Sci.(2016 Mar)