There are cases which are extremely prone to deposition in the mouth inspite of best care i.e. brushing. Such cases require frequent scaling or professional cleaning. Moreover one has to change the brush every few days in order for it to be effective. I have also tried to increase the hardness of the brush i.e. from soft to medium, with the advice not to use excessive force while brushing in order to avoid damage to teeth. Mouthwashes can also supplement and you can ask your local Dentist for it.