I think the federal loan limit is 224,000$. After that much you can receive grad plus loans. You will be awarded them
in addition to your other loans in an amount dictated by your dental school. Every dental school sets a yearly cost of attendance, which is typically more than sufficient. You can max out on those or not depending on your needs. You probably won't need more than they offer. I was offered up to more than 100,000$ this year even though my tuition was about half that. Don't worry, the hard part for most people isn't having too little money.