Is a dentist obligated to treat patient that can not pay?

No, dentists are not obligated to treat patients who cannot pay. Dentists are private business owners and are free to set their own policies regarding payment. Some dentists may choose to offer discounts to patients who are uninsured or have limited financial resources, but they are not required to do so. Ultimately, it is up to the individual dentist to decide whether or not to treat a patient who cannot pay.