Ditto on what was said above. For me, the main advantage in using care credit is the promotional period. I do have my own credit card, and it's got a higher limit than my Care Credit card... but that said, it also has something like 25% interest rate. So, if I were to charge $1000 in chin bills and paid it off in 6 months, I'd end up paying a crapload in interest... versus if I charged it on Care Credit, paid it off in the same 6 months, and didn't pay any interest.
For awhile, I carried a balance on my regular credit card (due to a $3700 pneumonia incident vet bill and week-long vet stay for my dog). The interest was killing me. Some months, when hours were getting cut at work, all I could pay was the same amount (or less!) for what I was getting charged in interest. It was ridiculous. Took me forever to pay it off, cause I probably ended up paying double the actual bill cause of all the interest. Of course, I didn't have Care Credit back then... but had I, I might have ended up paying only $3700.
I like Care rcedit cause I know it's there when I need it and it allows me to use my actual credit card as backup. Now, I hardly ever charge anything on my credit card, but I like knowing that I have my Care Credit card, and then if I somehow maxed that out (heaven forbid), I still have my other credit card to fall back on. That said... I don't have high limits... I know some people with like $30,000 limits on their credit cards... not me, my Care Credit is like $3700 and my regular credit card is like $5000, so... not that I want to max those out, but it'd be easier to do than $30,000!