 The study will enroll subjects into up to three study arms. Up to 33 subjects will receive multiple doses of study drug applied with a small brush typically used in dental varnish administration. Subjects will be enrolled in an 8:3 ratio. The Sponsor will perform unblinded microbiology review on an ongoing basis to determine whether to enroll additional 11 subjects into the next dose cohort or to terminate enrollment based on microbiology data. 