Watch Your Mouth Massachusetts: The Watch Your Mouth Coalition Is Working In Massachusetts, New Hampshire And Maine To Make Children's Oral Health A Priority. Objectives of the Watch Your Mouth Coalition are to Educate the public that tooth decay is the most common childhood disease that can cause diminished school performance and poor overall health. WYM advocates for wider access to preventive services, such as dental sealants and fluoride, and regular dental exams for all children.