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Data breaches → DentaQuest

Was your data in the DentaQuest breach?

2026 · dentaquest.com · ~2,553,599 accounts exposedCritical severity · 10/10

DentaQuest (dentaquest.com) suffered a data breach in 2026 that exposed around 2,553,599 accounts. If you had an account, some of your personal data may be circulating in leaked databases. The fastest way to know is to check your own email — free, in about 30 seconds, no password required.

What happened

In May 2026, the dental benefits administrator DentaQuest was the target of a ShinyHunters "pay or leak" extortion campaign that resulted in the group publicly publishing hundreds of gigabytes of data allegedly obtained from the company. The data included 2.6M unique email addresses along with names, addresses and phone numbers. Much of the data appeared in healthcare enrollment files (ASC X12 transaction sets) with some containing Medicaid IDs, while additional data appeared in member records and related files. DentaQuest acknowledged "a cybersecurity incident involving unauthorized access to a limited portion of our network", and advised they had contained the attack and mitigated the threat.

Breach details sourced from Have I Been Pwned, the industry-standard breach database. Risk analysis by Nullivo.

What was exposed, and why it matters

Not all breaches carry the same risk — what matters is which fields leaked. Here is what the DentaQuest breach exposed and what each item actually enables:

Government identifiers

The strongest identity-theft material there is — enough to open credit accounts or file fraudulent claims in your name.

Sensitive personal characteristics

Special-category data under UK/EU GDPR. Exposure can lead to discrimination, extortion or targeted harassment, and cannot be undone.

Home addresses

Home addresses feed people-search and data-broker sites, which republish them publicly. They also make phishing far more convincing and, in the worst cases, enable real-world harassment.

Dates of birth

Date of birth is a permanent identifier used to verify identity by phone. Combined with a name and address it is often enough to impersonate you.

Phone numbers

Enables SIM-swap attacks (hijacking your number to intercept SMS codes), smishing, and voice scams that appear to come from your bank.

Names and usernames

Links this leak to your other accounts — a reused username lets anyone build a profile of you across platforms.

Email addresses

Puts you on spam and phishing lists, and confirms to attackers that you hold an account with this service — which makes impersonation emails more believable.

Also listed in this breach: Dates of birth, Email addresses, Genders, Government issued IDs, Health insurance information, Names, Phone numbers, Physical addresses.

What to do if you were affected

These steps are ordered for this specific breach — the most urgent action given what leaked comes first.

  1. Government identifiers: Consider a credit freeze or fraud alert with the credit reference agencies, and watch for accounts you did not open.
  2. Sensitive personal characteristics: Under UK/EU GDPR you have a strong right to erasure here — exercise it with the service and with any site republishing the data.
  3. Home addresses: Get your address removed from data brokers — they re-list roughly every four months, so this needs repeating.
  4. Dates of birth: Never confirm your date of birth to an inbound caller — hang up and dial the organisation back on a published number.
  5. Phone numbers: Move two-factor authentication off SMS to an authenticator app or passkey, and add a port-out PIN with your mobile provider.
  6. Check whether your own email appears in this breach — run a free scan to confirm before you spend time on the steps above.

This breach put your details on data-broker sites

Because DentaQuest exposed sensitive personal characteristics and home addresses, this is one of the breaches that feeds people-search and data-broker sites. Those sites scrape leaked databases, combine them with public records, and republish the result as a searchable profile — which is how a single breach turns into a permanent public listing. Removal works, but brokers typically re-list within about four months, so it has to be repeated.

See our broker-by-broker removal guides →

How urgent is this now?

This breach is recent, so the data is actively traded and the risk is at its highest right now.

Remember: a breach can't be "un-leaked" — once a database is out, it exists in countless copies. The goal is to make the leaked data useless: change what can be changed, lock down what can't, and remove what has been republished.

Check if your email was exposed.Nullivo's free scan checks your own verified email against known breaches — including DentaQuest — in 30 seconds. No password, no signup, and we only ever scan your own email. Run your free scan →

Frequently asked questions

What data was exposed in the DentaQuest breach?

The DentaQuest breach exposed government identifiers, sensitive personal characteristics, home addresses, dates of birth, phone numbers, names and usernames, email addresses. The strongest identity-theft material there is — enough to open credit accounts or file fraudulent claims in your name.

How many people were affected by the DentaQuest breach?

Around 2,553,599 accounts were exposed, making it a large breach.

What should I do if I had a DentaQuest account?

Consider a credit freeze or fraud alert with the credit reference agencies, and watch for accounts you did not open. You can check whether your own email appears in this breach with a free Nullivo scan — no password required.

Breaches that exposed similar data

If the DentaQuest breach affected you, these breaches exposed comparable information — worth checking too, since leaked datasets are routinely combined.

See all breaches we cover →