My next suggestion is to carry around gum that isn't only sugarless but also supplemented through natural element called xylitol. Usually the desire for dentistry or equine dental supplies is rather low at this time unless the horse has damaged their teeth in some fashion. https://telearchaeology.org/TAWiki/index.php/Ace_Your_Dentist_Exam_-_8_Back-To-School_Tips_For_Healthy_Smiles