ESMA Tarter Cleaner E373 is a mildly acidic cleaning solution. ESMA E373 is a specially formulated solution for cleaning tarter accumulation on dentures and removing temporary or permanent cement on bridge work or crowns. ESMA E373 also cleans retainers, correctors, frankel and sagittal appliances, Schwartz plates, and bionators. Can be used ultrasonically or soaking. Ready to use; do not dilute.