To directly answer your question, I would say most dentists require either 50% down or third party financing like Care Credit, etc.. , BUT the most important question is do you have the best dentist to do your Invisalign treatment and that is why I stated that it was actually good not to have dental insurance. Dental Insurance will set a maximum fee for any dental care they pay for and that includes Invisalign Orthodontics. That insurance company fee usually is lower than the fee that dentists who offer the best care charge and that puts pressure on the dentist to do abbreviated treatment or use cheaper technology, etc., etc and in addition if you had the money that the insurance company would have pocketed on all the premiums that they collect on an person like yourself's insurance over the years, you could undoubtedly have gotten your Invisalign treatment for free.