I don't get why you posted this post when you are not going to listen to people.
1) You didn't do enough research on what you should do on your situation (sub 3.0 gpa), which shows your laziness.
2) People told you already what you have to do. You need to get As, no research, don't worry about letter but freaking get As in many upper div classes.
The only thing holding you right now is your grade, not mediocre letters, average DAT or your ECs. Either way the letters can be either good (professor knows you well and can write positive things about you , whether academic wise and/or work ethics, personality, etc), mediocre (writes a letter how you are good student and you can get As but doesn't go into personal stuff), or bad ( tells adcoms to not accept you), but most of the cases, professor will write you either good or mediocre ones.
With your GPA you are looking at doing at least 2 years of academic courseload. And you probably have to retake DAT not only to increase your chances, but also because by then your DAT will be expired.
If you have questions, search doctooth and read the files that he/she uploaded (i.e. Miniguide to dental school, spreadsheet of stats). And lastly have some common sense. You are competing with plenty of people with 3.6+ gpa and 20AA DAT. The lowest accepted GPA from most schools was barely sub 3.0( 2.96gpaish). Do some research before asking or have some knowledge on how to maximize your chances before you apply to dental school.