MultilevelrelaxationandatrophycauseskinsaggingBoYan''stissuerestorationstartsfromtheperiosteum,alongthedirectionofmuscle,tissueandskintexture.Beforethetissueisrestored,theskinandmeatareverycomfortable,andthelevelisincreasedbyaboutonetotwocentimeters,raisingthetissuetowhereitshouldbe. .