Why your dentist can text you but marketers can't

By MercPrivacy · Published 2026-06-08 · Updated 2026-08-05

Appointment reminders, delivery updates and login codes ride on a different kind of consent than marketing blasts. The tiers explain which texts are legal and which are not.

Your phone makes no distinctions. The appointment reminder from your dentist, the delivery update from the pharmacy, the login code from your bank, and the fourth marketing blast this week from a warranty operation all land in the same view with the same chime.

The law makes sharp distinctions, and knowing where the lines sit clears up something that genuinely puzzles people: why some businesses can text you freely, no questions asked, while others break rules with every send.

The difference is not who they are. It is what the message is for, and what kind of permission that purpose requires.

## The consent ladder

Think of texting permission as a ladder with two main rungs, and the message's job decides which rung applies.

- **Informational and transactional texts** — appointment reminders, delivery notices, fraud alerts, two-factor codes, "your prescription is ready." When you gave a business your number in the course of dealing with it, you generally agreed to messages about that dealing. Your dentist texting about Tuesday's cleaning is operating inside permission you actually gave. - **Marketing texts** — anything designed to sell you the next thing. Here, implied permission is not enough. Marketing texts require prior express written consent: a signed or checked agreement that names the sender, makes plain you agreed to marketing messages, and discloses that consent was not a condition of buying anything.

Watch for the disguise this distinction invites. Because the transactional lane carries more permission, senders dress marketing up as service: "your account needs attention," "your package has an issue," "your warranty is about to lapse." The test is whether the message references a real transaction you can verify on your own — an order you actually placed, an appointment you actually booked. A "transaction" you cannot locate is a pitch wearing a costume, and it belongs on the marketing rung with everything that implies.

Text messages are treated as calls under the federal telemarketing statute, so none of this is a technicality about format. It is the same body of law that governs robocalls, applied [per message](https://mercprivacy.com/knowledge/per-message-exposure-adds-up) — which is what gives the marketing rung its teeth.

## What handing over your number actually meant

Giving a business your number is consent with a shape. It covers the relationship you set up, for the purpose you set it up.

- **The dentist** got your number for scheduling. Reminders, confirmations, a rescheduling request: all inside the shape. - **The pharmacy** got it for prescriptions. "Your refill is ready" fits. A weekly promotion for supplements is a different kind of message wearing the same sender name. - **The retailer** got it at checkout for delivery updates. That is not a subscription to a marketing list, however much the follow-up texts pretend otherwise.

The move to watch for is migration: a number handed over for a transaction quietly drifting onto a promotional list. The moment messages shift from servicing your transaction to selling the next one, the consent question resets — and the sender needs the written kind, which you almost certainly never gave. What that written record must contain is [its own subject](https://mercprivacy.com/knowledge/what-a-valid-consent-record-looks-like).

## The relationship wrinkle, and how it ends

A real business relationship does change things. A company you actually patronize has more room to contact you than a stranger does, and parts of the rulebook make allowance for that. This is why the gym you belong to texts with a confidence the warranty spammer has to fake.

But the allowance has a hard edge, and the edge is the part that matters in practice: no relationship survives a stop request.

- **Every company must keep an internal do-not-call list** and honor a stop request when it hears one. This obligation stands on its own — it applies even where [the national Do Not Call registry](https://mercprivacy.com/knowledge/do-not-call-registry-explained) does not reach. - **You can revoke consent by any reasonable means** — replying STOP, saying stop on a call, sending an email. Under current federal rules, the sender must honor the revocation within a reasonable time, capped at ten business days. - **Revocation outranks every rung of the ladder.** Transactional, marketing, longtime customer or stranger: if you say stop, the texting stops. Even your dentist has to honor it. You would be turning off a genuinely useful reminder system, but the right is yours.

One more wrinkle: the relationship does not travel. Being someone's customer says nothing obvious about the crowd of affiliates, vendors, and "partners" around them, so when a brand you recognize starts texting from a company you do not, the consent question is live again — and it is the sender's question to answer, not yours.

> The dividing line is not who is texting you. It is whether the message serves your transaction or their pipeline.

## A quick sorting test

Run any text through four questions and it sorts itself.

1. **Did I do business with this sender?** If not, and the message is selling something, you are looking at a consent problem. Theirs, not yours. 2. **Does it serve something I initiated** — an order, an appointment, a login? That is the exempt lane, and it is exempt for a reason: those are the texts people actually want. 3. **Is it selling the next thing?** Then written consent was required. Ask yourself whether you ever signed anything resembling that. A vague memory of a checkout page does not count. 4. **Did I tell them to stop?** After a stop request the ladder collapses entirely. Continued marketing texts are violations regardless of category — $500 per message in statutory damages, up to $1,500 where willful.

Texts that fail the test are the ones with consequences attached, and they are worth documenting from the first failure: [the evidence file](https://mercprivacy.com/knowledge/the-evidence-file-what-to-keep) covers exactly what to keep and how.

## If this is your inbox

We spend our days sorting the exempt from the unlawful and acting on the second pile. [Stephanie](https://mercprivacy.com/stephanie) answers instantly and free if you want a read on a specific sender, or call (830) 587-5011. We are not a law firm; when a matter requires legal representation, a licensed attorney is engaged.