You can learn about Helen’s film and stage career from her IMDB entry. The important thing for our purposes is a 1905 article titled “How An Actress Feels When Her Teeth Begin To Go” describing and promoting a dental practice in Chicago (The Inter Ocean, April 2, 1905). In this story, Helen Lowell offered a testimonial about the dental care she received from Dr. G. Gordon Martin while she was performing in a production of “Mrs. Wiggs in the Cabbage Patch.”
“ . . . Excepting for the discomfort of sitting in a chair with a rubber in my mouth—a coffer dam, I think they call it, and I’m ready to believe the last half of its name is true—I had not one single twinge of pain. Look here—“
And Miss Lowell parted her plump lips and showed as brilliant a double row of teeth as ever shone in any face.
“Dr. Martin brought them up to that,” said she, “and dentally speaking, I’m fixed for life.”
And there you have it. A double row of teeth fixed for life. With that kind of endorsement, perhaps Dr. Martin should have promoted himself as a dentist for ancient giants rather than a dentist for actresses.
Giantologists have been repeating the claim of a connection between large skeletons and “double rows of teeth” at least since I was in high school in the mid-1980s. They’ve had many decades now to figure out this “mystery.” It turns out that even the most cursory search of newspaper archives (the same archives they use to collect all of their examples) shows these phrases to be ones that were commonly used to describe the teeth of living individuals who most certainly were not ancient giants. That begs the question of how hard they've actually been trying. Either the giantologists haven’t really been putting a whole lot effort into trying to figure it out or they’d rather actually NOT figure it out. I guess those aren't necessarily mutually exclusive. (The third possibility, that they've tried really hard but just couldn't do it, I find to be unlikely given how easy it has been to collect this information). Either way, the information is out there in plain sight and has been for a long time.
Severing the link between “giant skeletons” and “double rows of teeth” undercuts one of the foundational claims/assumptions of many of the giantologists: that there was a “race” of giants that can be identified based on physical characteristics of the skeleton. I’m still waiting for a response from any of them that want to defend this idea and tell me how Abigail Fillmore, Teddy Roosevelt, and Helen Lowell fit into their conceptions of giants, Nephilim, and what it means to have a "double row of teeth."