Most dental schools look at the overall package, not just the grades. If you would like a more specific answer, contact the dental schools of your choice and ask what the average acceptance GPA's were for the preceding classes. Most students pay with student loans. This is not undergraduate anymore, and student loans can reach the 10's of thousands of dollars each year. Since dental school is not cheap, it is always best to explore other options.
Many dental students choose the military as an option for paying for their education.
They are not all the same, so if you are interested, you should contact a recruiter from each once you are accepted to a dental school and weigh your options. As most of us know, dental cavities are on the down slope, and have been for quite some time. With the discovery of benefits of fluoride and fluoridated water, prevalence of cavities is much lower now than 30 years ago. However, with cavities decreasing and life expectancy increasing, dentists are faced with a growing baby boomer and aging patient population that are maintaining their teeth. Therefore, the needs for dentists have shifted from filling cavities to increased restorative and aesthetic dentistry demands.