This is true.
@ Hemorrage:
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https://www.aamc.org/data/facts/applicantmatriculant/
there were about 44k applicants, and about 19k Matriculants = 43/44% For Medical School in 2011.
http://www.adea.org/publications/tde/Documents/Forms/AllItems.aspx?Paged=TRUE&p_FSObjType=0&p_FileLeafRef=Distribution%20of%20Race%20Among%20Professionally%20Active%20Dentists.ppt&p_ID=142&View={2C47CDD8-6C1A-4DD1-8026-5B428A026978}&PageFirstRow=101
% of Applicants enrolled in Dental school is about 41.2 in 2010 ( . This does not mean getting into dental school is more difficult, it merely points out that your comment " far fewer applicants" is not a great argument, because there are also far fewer spots available as well.
I believe getting into a U.S MD program is the most competitive. But I believe becoming a physician is easier due to the multiple options available to pre-med students ( DO and Caribbean). There is no Caribbean route for dental, and if one decides to go to dental school abroad(which might arguably be just as competitive , if not more competitive), there are intense regulations in order to return and practice in the U.S.
@ DrCaliboy and Parklife
According to ADEA: the avg total gpa of
dental school matriculants = 3.53 (2011), and science gpa: 3.45
According to AAMC: the avg gpa of
medical school matriculants = 3.76 (2011), and science gpa of 3.61