The best way to think of how Care Credit works for a dental office, is just like with a "regular" credit card (Mastercard/VISA/AMEX/etc) whenever my front desk swipes one of those as a patient pays for their procedure, the credit card company "charges" me a percentage of the fee the pateitn is having us charge their card with (in my office's case it's current 1.9%). The Credit Card Company then pays me the rest of the charged amount and the patient pays the credit card company the amount they had my office charge and possibly interest as well depending on how long it takes them to pay the credit card company the full amount charged.
Care Credit is exactly like that in essence. The patient "applies" to Care Credit for $X ahead of time (where $X is the amount of the proposed treatment plan that the patient's insurance won't cover, or above and beyond what they feel comfortable financially paying at that time). Care Credit will approve or deny their request for the loan they are taking out from care Credit to pay for their dental work. Based on a combo of the amount of the loan the patient is looking for, the length of time they want to pay the loan back to care Credit over, and the patient's credit history, will determine the payment terms that care Credit will offer the patient. My office has nothing to do with those final terms. My office will get paid the full amount, even if ultimately that patient defaults on their loan from care credit. Care Credit "makes" some money from me, in the form of the amount that they hold back from what we charge the patient and then "bill" the patients Care Credit account - this amount too can vary with the amount that the patient is approved for and charges, and then Care Credit, if it is an interest baring loan they issue to the patient also makes money from the patient.
In my office, Care Credit has been a very straightforward, GOOD program both for the business side of my practice and also the ability to deliver care to patients who may not be able to afford a larger sum at once. A win-win situation!