from the perspective of someone who served on the admissions committee, life experience is one of the ONLY things that can compensate for poor stats (and it depends on how poor... if it's so poor there's doubt if you can handle dental school, then no go. But if it's just one or two bad grades or below average DAT scores, you're still fine).
Think about like this... school wants to have a high average DAT/GPA to brag about. If they're going to accept someone with below average stats, there has to be a reason to balance that. And the reason is, this individual can contribute something outstanding to the class, either because of their life hardships, or unique careers like being in the army or being some diamond gemologist, or unique experiences (Mormon missions trip, working for NASA), or being a parent. These would make you stand out from the more typical science major grads with strong stats. It's your job to present your life experiences in a way that stands out positively and help the admission officer mentally fit you into the class