Frankel says she started the injections three years ago as a result of her grinding her teeth since she was in her 20s. She also began wearing a night guard eight years ago, which alleviated some of it, but then her dermatologist suggested she try Botox in her jaw because "it's so tense."
"I actually saw him yesterday and I showed him the pictures, and it has literally -- you can see that my jaw has completely changed -- because it’s like a muscle, it's like working out with weights," she further explains. "My jaw from grinding so many years was like this [closed fist]."
Indeed, a look at Frankel from a Skinnygirl Cocktail pre-party in February 2013 (right) as opposed to a shot of her at the 2016 Breast Cancer Research Foundation Hot Pink Party last month (left) shows a much softer jawline.
Frankel says her new look even inspired her current 'do, a chic bob as opposed to her formerly long locks.
"That's also why I think I could take a shorter haircut," Frankel says.
The reality star admits she's done Botox on other parts of her face, but says she only undergoes the treatment about once a year. She maintains that she's never had any invasive plastic surgery, although Frankel has been open about getting breast implants in the past.
"I have not had a nose job. I have not had anything done," she stresses.
"It's been by far the most difficult thing I've ever been through," Frankel exclusively told ET about her divorce. "It was really brutal and I would cry every day, and now that I'm coming out of it, I feel like I've survived something."
"It's not over, but when it is over, we're going to party like it's 1999," she added.