The present invention is in the field of delivering an active substance to the oral cavity and relates to mucoadhesive active composition and corresponding mucoadhesive dosage form, which can deliver an active substance within the oral cavity, especially an orodispersible tablet for delivering probiotic substance. The present invention also relates to a method of producing the said composition and a method of processing the composition into a mucoadhesive dosage form, especially an orodispersible tablet. The present invention moreover relates to a system and a method for testing the mucoadhesion of a dosage form.