Deep Cleaning: Do I Really Need It? What Your Gum Measurements Mean

Told you need a deep cleaning? What your gum measurements mean, what the treatment involves, and what to ask before you say yes.
Dentist checking the gums of a smiling patient in the dental chair

You go in for your usual cleaning, the one your plan covers twice a year. You sit down, the hygienist checks your gums and, at the end, you hear: “You need a deep cleaning.” And with those words comes a treatment estimate you weren’t expecting.

If your first thought was “they’re trying to sell me something,” you’re not alone. It’s one of the most common complaints among Miami patients: “I came in for a cleaning and walked out with an estimate.” Often, a deep cleaning really is needed. The problem is that hardly anyone explains why.

This guide shows you how to read your gum measurements, what a deep cleaning really is, and what to ask before you agree to one, at any clinic.

Gingivitis and periodontitis: not the same thing

Both are gum diseases, but they’re at different stages.

  • Gingivitis: the gum is inflamed by plaque and tartar. It often bleeds when you brush or floss. There’s no bone loss yet and, with a regular cleaning and good home care, it’s reversible.
  • Periodontitis: the inflammation has moved below the gumline and starts to damage the bone and tissues that hold the tooth in place. “Pockets” form where tartar and bacteria build up beyond the reach of your toothbrush. Lost bone doesn’t grow back on its own, but the disease can be controlled so it doesn’t progress.

The difference matters because a regular cleaning is designed for a healthy mouth or one with gingivitis. Once there’s periodontitis, cleaning only above the gumline leaves the problem hidden underneath.

What the numbers the hygienist calls out mean

Have you ever heard the hygienist say “three, two, three, four…” while running a thin instrument around each tooth? That’s periodontal probing. It measures, in millimeters, how deep the groove between the gum and the tooth is. Usually six measurements are taken per tooth.

  • 1 to 3 mm: typical for healthy gums. Your toothbrush and floss can clean that area.
  • 4 mm: a warning sign. It may be inflammation or the start of a pocket. It should be looked at together with bleeding and X-rays.
  • 5 to 6 mm: usually indicates a periodontal pocket. At that depth, tartar is out of reach of a regular cleaning and of your toothbrush.
  • 7 mm or more: usually corresponds to more advanced disease, which may call for a more complete periodontal evaluation.

The numbers alone don’t tell the whole story. The dentist also looks at whether the gum bleeds on probing (a sign of active inflammation), whether there’s bone loss on the X-rays, whether the gums have receded, and whether any tooth is loose. A single 4 mm reading isn’t the same as several 5 or 6 mm pockets that bleed in different areas of the mouth.

Tip from the PureSmile team

Always ask for a copy of your periodontal chart, the sheet with the measurements for each tooth. It’s your information, and it helps you compare at your next checkup or get a second opinion. If a clinic won’t show you the measurements, ask why.

What a deep cleaning is (scaling and root planing)

The technical name is scaling and root planing, or SRP. It’s a treatment for periodontitis, not a “more thorough cleaning” just for the sake of it.

  • Scaling: removing tartar and plaque from below the gumline, inside the pockets.
  • Root planing: smoothing the root surface so the gum can reattach to the tooth and the pocket can shrink.

A regular cleaning, by contrast, works mostly above the gumline. That’s why they aren’t interchangeable: if you have deep pockets, a regular cleaning alone doesn’t treat the disease.

Does it hurt? What does it feel like?

It’s usually done with local anesthesia in the area being treated, so during the procedure you feel pressure and vibration more than pain. Afterward, it’s common for your gums to feel tender and to have some sensitivity to cold for a few days. If you’re nervous about the dentist, say so from the start: a good explanation and a calm pace make a big difference.

How many visits does it take?

The mouth is divided into four quadrants (upper right, upper left, lower right and lower left). The most common approach is to treat two quadrants per visit, over two visits, although it depends on how many areas are affected. You don’t always need all four: if the pockets are only in one part of the mouth, treatment can be limited to that area.

A few weeks later there’s usually a re-evaluation: the gums are measured again to see whether the pockets have shrunk. After that, instead of the usual preventive cleaning, many people move on to periodontal maintenance every few months.

Smiling older patient sitting in the dental chair before a gum checkup

Why insurance treats it differently (and where the surprise bill comes from)

This is where a lot of complaints start. Your plan may cover two preventive cleanings a year, but a deep cleaning is not a preventive cleaning. Insurers classify it as periodontal treatment, usually under basic or major services. That can mean:

  • A coinsurance percentage or a copay you didn’t have with a regular cleaning.
  • A deductible, if your plan has one.
  • Frequency limits (for example, how often it can be repeated per quadrant).
  • On some plans, pre-authorization before it’s done.
  • Follow-up periodontal maintenance is also billed under a different code than a preventive cleaning.

The same goes for Medicare Advantage plans: many include some dental benefit, but each plan decides whether it covers periodontal treatment, in which category and with what limits. Original Medicare generally doesn’t cover routine dental care. Don’t assume anything: the only way to know what you’ll pay is to verify your specific plan before your appointment. If you’d like, we explain how we’ll handle it on our Medicare dental page for Kendall and in dental insurance in Kendall.

Tip from the PureSmile team

Before you agree to a deep cleaning, ask for a written breakdown, per quadrant, of what your plan covers and what you’ll pay. That way the bill won’t surprise you later. If you’re there with your mom or dad, ask for the explanation to be given to both of you.

Questions you can ask any dentist before you agree

Asking questions isn’t being distrustful or rude. A good professional appreciates a patient who wants to understand. These will help you decide calmly:

  1. “Can you show me the measurements?” Ask to see the periodontal chart and which teeth have pockets of 4 mm or more.
  2. “Where is it bleeding?” Bleeding on probing indicates active inflammation.
  3. “Is there bone loss on my X-rays?” Ask them to point it out on the screen.
  4. “Do all four quadrants need treatment, or just some areas?”
  5. “What happens if I wait?” An honest answer explains the risk without scaring you.
  6. “How much does my plan cover, and how much do I pay?” In writing, before you start.
  7. “What comes next?” Re-evaluation, how often maintenance is needed, and what it costs.

And what happens if I wait?

Periodontitis usually doesn’t hurt at first, which is why it’s easy to put off. But if there are active pockets and they aren’t treated, bone loss usually keeps progressing little by little. Over the years, that can lead to receding gums, loose teeth and, in advanced cases, lost teeth. Replacing them costs considerably more than treating your gums in time, as we explain in why a cleaning every 6 months saves you thousands of dollars.

Waiting a few weeks to learn more, verify your insurance or get another opinion is reasonable. What isn’t a good idea is going years without getting measured again.

A second opinion is always okay

If something doesn’t sit right with you, ask for your periodontal chart and your X-rays and take that information to another dentist. It’s your right, and it’s standard practice. If the measurements match, you’ll have more peace of mind to get started. If they don’t, you’ll have more information to decide.

And if it’s been years since you last saw a dentist, that’s okay. No one should judge you for it. What matters is knowing how your gums are doing today.

How we’ll do it at PureSmile Miami

PureSmile Miami opens November 1, 2026 in Kendall, at 8000 SW 117th Ave, Suite 100. We want you to leave your appointment understanding what’s going on: we’ll show you your gum measurements, explain what’s urgent and what can wait, and verify your plan for free before we start. If you need treatment, we’ll give you the price in writing, in English or Spanish, before you sit down in the chair.

Write to us or join the waitlist and we’ll get back to you.

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October 1, 2026