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
- ^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)