SmileDirectClub, the at-home teeth-straightening service, is on its way to becoming a public company. SmileDirectClub is seeking to raise up to $100 million in its IPO, according to its S-1 filed today. The number of shares and price range for the offering have yet to be determined.

Prior to this, SmileDirectClub reached a $3.2 billion valuation following a $380 million funding round last October. Investors from Clayton, Dubilier & Rice led the round, which featured participation from Kleiner Perkins and Spark Capital. This funding came on top of Invisalign maker Align Technology’s $46.7 million investment in SmileDirectClub in 2016, and another $12.8 million investment in 2017 to own a total of 19% of the company.

In 2018, SmileDirectClub’s revenues came in at $432.2 million, a significant uptick from just $147 million the year prior.

The company ships invisible aligners directly to customers, and licensed dental professionals (either orthodontists or general dentists) remotely monitor the progress of the patient. Before shipping the aligners, patients either take their dental impressions at home and send them to SmileDirectClub or visit one of the company’s “SmileShops” to be scanned in person. SmileDirectClub says it costs 60% less than other types of teeth-straightening treatments, with the length of treatments ranging from four to 14 months. The average treatment lasts six months.

Though, members of the American Association of Orthodontists have taken issue with SmileDirectClub, previously asserting that SmileDirectClub violates the law because its methods of allowing people to skip in-person visits and X-rays is “illegal and creates medical risks.” The organization has also filed complaints against SmileDirectClub in 36 states, alleging violations of statutes and regulations governing the practice of dentistry. Those complaints were filed with the regulatory boards that oversee dentistry practices and with the attorneys general of each state.

SmileDirectClub explicitly calls out those issues in its S-1 as potential risk factors. Here’s a key nugget:

A number of dental and orthodontic professionals believe that clear aligners are appropriate for only a limited percentage of their patients. National and state dental associations have issued statements discouraging use of orthodontics using a teledentistry platform. Increased market acceptance of our remote clear aligner treatment may depend, in part, upon the recommendations of dental and orthodontic professionals and associations, as well as other factors including effectiveness, safety, ease of use, reliability, aesthetics, and price compared to competing products. Furthermore, our ability to conduct business in each state is dependent, in part, upon that particular state’s treatment of remote healthcare and that state dental board’s regulation of the practice of dentistry, each which are subject to changing political, regulatory, and other influences. There is a risk that state authorities may find that our contractual relationships with our doctors violate laws and regulations prohibiting the corporate practice of dentistry, which generally bar the practice of dentistry by entities. Two state dental boards have established new rules or interpreted existing rules in a manner that purports to limit or restrict our ability to conduct our business as currently conducted.

Additionally, as the S-1 notes, a national dental association recently filed a petition with the U.S. Food and Drug Administration claiming that SmileDirectClub’s manufacturing violates “prescription only” requirements. While no regulations or laws have been passed that would affect SmileDirectClub to date, it’s a possible scenario that would greatly impact the company’s core business.