The present invention relates to an oral care composition with a high water content which has improved robustness towards microbial challenge. The oral care composition includes compositions comprising from 0.125 wt% to 0.75 wt% of a water soluble source of stannous ions, wherein the composition comprises at least 50 wt% water and wherein the source of stannous ions is selected from the group consisting of stannous chloride, stannous pyrophosphate, stannous formate, stannous acetate, stannous gluconate, stannous lactate, stannous tartrate, stannous oxalate, stannous malonate, stannous citrate, stannous ethylene glyoxide, and mixtures thereof.本發明係關於具有高含水量之口腔保健組成物，其具有改良之向微生物挑戰的強健性。該口腔保健組成物係包括含有由0.125重量%至0.75重量%水溶性亞錫離子來源之組成物，其中，該組成物包含至少50重量%水，且其中該亞錫離子之來源係選自由下列所組成之群組：氯化亞錫、焦磷酸亞錫、甲酸亞錫、醋酸亞錫、葡糖酸亞錫、乳酸亞錫、酒石酸亞錫、草酸亞錫、丙二酸亞錫、檸檬酸亞錫、亞錫伸乙基過氧化脲，及其混合物。
