An algal extract-based composition for oro-dental use is provided. This composition comprising a mixture of algae with at least Ascophyllum nodosum and Fucus spp. is characterized in that said mixture of algae has a proportion of Ascophyllum nodosum of at least 90% of the weight of the mixture and that the proportion of Fucus spp. is at most 10% of the weight of the mixture, and in that said extract is combined with a natural surfactant and/or with a zeolite or a mixture of zeolites. Uses of said composition, in particular for dental prevention and/or care, are also provided. Applications in the oro-dental field, both preventively and curatively.