California Dental Corporations: Formation, Ownership, the DSO Line — and the 12-Month Rule

A California dental practice that incorporates has one lane: the professional dental corporation. LLCs can't render professional services in California, and the Dental Practice Act adds its own layer of entity rules — including a naming statute, a fictitious-name permit regime with real money attached, and the single most distinctive provision in all of California professional-corporation law: a statutory twelve-month wind-down when a dentist dies or becomes incapacitated.

The entity fundamentals — formation steps, taxes, governance — live in our California Professional Corporations pillar guide. This piece is the dentist-specific layer. Orientation, not legal advice for your situation.

Who can own a dental corporation#

Licensed dentists must hold at least 51%. Corporations Code section 13401.5's dental subdivision then allows an unusual bench of allied minority owners — one that reaches further down the team ladder than medicine's:

Licensed physicians and surgeons · dental assistants · registered dental assistants · registered dental assistants in extended functions · registered dental hygienists · registered dental hygienists in extended functions · registered dental hygienists in alternative practice.

Note what that means: not just hygienists but dental assistants — a named category that isn't an individually licensed profession in the usual sense — can hold equity in the practice, which makes genuine team-ownership structures possible in dentistry in a way most professions can't match. The two standard limits still govern: allied owners' shares can't exceed 49% combined, and allied shareholders can't outnumber dentist shareholders.

Hygienists also get an ownership path of their own. A registered dental hygienist in alternative practice — the RDHAP license that permits hygiene practice outside a dental office, serving homebound patients, schools, residential facilities, and designated shortage areas — can form an RDHAP corporation, a separate professional-corporation type in which dentists, RDAs, RDHs, and extended-function hygienists may hold the minority. For a hygienist building an independent mobile or facility-based practice, that's the entity.

The name, and the $650 permit that breaks when you grow#

Dentistry has an actual designator statute: under Business and Professions Code section 1804, a dental corporation's name — and any name it renders services under — must include the words “dental corporation” or wording or abbreviations denoting corporate existence. Practice under a trade name — “Bright Smiles Dental Group” — and you've entered the fictitious-name permit regime of section 1701.5: the permit comes from the Dental Board, the fictitious name must contain “dental group,” “dental practice,” “dental office,” or “dental corporation,” and every practitioner on the application must hold an active license that isn't subject to a pending enforcement action.

The mechanics have teeth. The application fee is $650, the permit runs two years with a $325 renewal, and it's address- and structure-specific — relocate and you reapply. The gotcha that catches growing practices: departing dentists must be reported within 30 days, and adding a dentist means canceling the permit and applying again. Budget for that in any associate hire or buy-in timeline, because the permit paperwork moves slower than the deal.

The 12-month rule: dentistry's statutory wind-down#

Here's the provision no ranking guide covers, and the one every practice owner's estate plan should know about. For every other professional corporation, a deceased shareholder's shares must reach licensed hands within six months, and nobody unlicensed may run the practice in the interim. Dentistry alone gets a statutory bridge: when a dentist dies or becomes incapacitated, a designated person may keep the practice running for up to twelve months — employing licensed dentists and dental assistants and charging for their services — without it constituting the unlicensed practice of dentistry.

The regime, built across Corporations Code section 13407 and Business and Professions Code sections 1625.3 and 1625.4:

• Who can run it: the incapacitated dentist's legal guardian, conservator, or authorized representative; the deceased dentist's executor or administrator; or the trustee of a trust or subtrust that holds only the dental practice's assets and was established solely to dispose of the practice on the dentist's death or incapacity. That last one is narrower than it sounds — a general revocable living trust holding the practice alongside the house and the brokerage account does not qualify.
• The ground rules: the designee notifies the Dental Board — practice details, estate or trust information, and the names and license numbers of the dentists who will treat patients — and must not interfere with, control, or direct any licensee's professional judgment. Patients of record get mailed notice within 30 days, including how to obtain their records.
• The clock: twelve months from death or incapacity, or until the practice is sold — whichever comes first. And the corporation's shares must transfer to licensed hands within the same twelve months, effectively doubling the six-month window other professions get.

The planning takeaway: the statute gives your family a bridge, but only if someone can walk onto it. A dedicated practice-disposition subtrust that satisfies the statute's narrow terms, a buy-sell agreement with valuation and licensed-transferee mechanics, and interim-coverage arrangements with associate dentists turn the twelve months into a sale at practice value instead of a fire sale at month eleven. That's drafting work done while everyone's healthy — it cannot be improvised by an executor learning dentistry regulation in a week.

DSOs after SB 351: assist, don't control#

Dental support organizations built modern group dentistry, and California didn't ban them — it drew their boundary in statute. SB 351, effective January 1, 2026, expressly covers dental practices: private equity groups and hedge funds involved with a practice may not interfere with professional judgment — including diagnostic decisions, referrals, treatment responsibility, and patient-volume or hours targets — or exercise control over practice operations including patient records, clinical hiring and firing, payor contracting, and billing and coding decisions. Contract terms that cross the line are void and unenforceable, the Attorney General can sue — and corporate-practice enforcement in 2026 has already produced a high-profile settlement with a national DSO.

What a DSO agreement can still lawfully sell: facilities, equipment, nonclinical staffing, IT, marketing, payroll, and billing execution under decisions the dentists make — with post-SB 351 practice trending toward flat fair-market-value fees rather than percentage-of-revenue structures. And on ownership the rule is absolute: a DSO can never hold shares in the dental corporation. Majority stays with licensed dentists; the only eligible minority holders are the dental-team categories above.

Everything else runs through the standard playbook#

Formation follows the professional-corporation sequence — ARTS-PC articles ($100), bylaws carrying the licensed-owner and transfer restrictions, the Dental Board's certificate-of-registration exemption (dental corporations don't register with the Board; the FNP is the only common Board filing), the annual Statement of Information, malpractice coverage, and the S-election conversation with your CPA. The tax stack is the standard one too, including the permanent first-year $0 minimum franchise tax for new California corporations. The pillar guide walks every step.

One dental-specific closing note: associate-to-owner buy-ins are how most dental practices change hands, and every structure above converges there — the buyer must be a licensed dentist or an allied-list holder within the 49% cap, the share transfer must honor the restrictions, the FNP must be redone for the new roster, and the buy-sell agreement is what makes the §13407 clocks automatic instead of frantic. Paper the path before you recruit the associate.