I am not an RDA but I am a certified dental assistant. I've been working in my families dental practice for the past 3 years now and just this year I have been obtaining my certificates in Coronal Polishing, Radiation Safety, Infection Control, etc. I am a reapplicant and I have been sending the dental schools my certificates and have been telling them of my plans of becoming an RDA. I think it helped a bit since it allowed me to keep in constant contact with the admissions offices. I received 2 more interviews after updating some schools and I just received an acceptance. I think becoming a dental technician would be better which is what my friend did and he got several more interviews than I and I believe we had the same stats. Being a dental tech will show that you've prepared your hand skills for dental school, but becoming a tech may cost more.