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. 2021 May 7;21:242. doi: 10.1186/s12903-021-01605-0

Fig. 3.

Fig. 3

OMT, OMT of perioral muscles (a), OMT of masticatory muscles and tongue: including chewing gum vigorously with posterior teeth and shaping the softened chewing gum into a ball on the front of the tongue (b), lifting the tip of the tongue and sticking the gum to the hard palate (c), pressing the tongue against the hard palate and flattening the gum (d)