Ora MD Original Strength

Does it stain the teeth as the prescription one I got from dentist ?

How long does 1 bottle last? Debating if buying three is necessary, or one will suffice for now.

Hello, Just got this product in the mail today. Do I need to rinse after brusing with this product? Or do I just brush and leave it be?

How can this be used with tooth brush for brushing the teeth? Do you put drops of this on the tooth paste?