I think for younger dentists, ages 25-40, there are slightly more women. But the profession overall is still male dominated, not implying more men is negative for the field.
Females are also dominating undergraduate schools, incase you didn't notice. Does that mean feminization of education and most careers in general? Nope.
But back to dentistry... some of my female classmates are not practicing dentists any more. 1 married to a priest and focused on "god" right after she graduated. Another 2 or 3 are trophy wives now and married to wealthier men. Some are hard core; opened practices and are very successful, specialized and at the top of their games. What am I getting at? Females will always have more unique options than men in and outside the field, which is a good thing.