I know people that have made it with those scores, but they had a really good story to explain why they didn't do better... such as extreme hardships. Some schools don't care about "a lot " of hours, as long as you have some, ur good. Words from the director at UTHSCA, it doesn't matter if you have 100 hr dental experience or a thousand, as long as you have some experience... that tells us you know what you're getting into. But ofc, dental lab does make you a better applicant. Take what I say with a grain of salt, but I think you're going to need a strong personal statement to accommodate and be a competitive applicant. I would start working on a masters during the application cycle, or at least continue taking classes and show them the upper trend... even if it's one or two courses a semester.. and make sure you register in ones you'll for sure earn an A in. Also if your volunteering hours are limited, use them in places like Hospice...things that stand out vs a dog orphanage (or u can do both if u got the time). Good luck.