You went in for your usual visit and left with a new phrase: deep cleaning. If you typed "deep cleaning teeth" into a search bar that night, you were really asking one thing. Is this real, or is it an upsell?
That is a fair question, and the answer is already on your chart. The numbers called out during your visit are measurements, and once you know what they measure, you can check the recommendation yourself.
People call it a deep cleaning, but its real name is scaling and root planing. It treats periodontal disease: an infection of the tissue and bone that hold your teeth in place.
What are the numbers on my gum chart measuring?
Your gum does not glue onto your tooth. It wraps around it like a collar, with a small gap between the two, and each number is the depth of that gap in millimeters.
To take it, a thin probe with millimeter marks slides into the gap until it stops. The European periodontal consensus describes gentle probing at 0.2 to 0.25 newtons, at six spots on every tooth (Herrera and colleagues, 2025). That's about the weight of four or five nickels resting on a fingertip. Six spots a tooth is why the numbers come in a long run.
The same report calls a mouth healthy when it bleeds at fewer than 10% of those spots. It also has to have lost none of the attachment that holds gum to tooth.
Bleeding is the second number that matters. A healthy lining does not bleed at that light pressure, so bleeding means the tissue is inflamed. A Swiss study followed 41 patients for two and a half years after gum treatment. A spot that kept not bleeding stayed stable 98% of the time (Lang et al., 1990).
Neither number hurts, and that is why this disease is so easy to miss. The bacteria most tied to it track with exactly these two signs, pocket depth and bleeding on probing (Socransky et al., 1998). A pocket can deepen for years without one sore day.
Why can't I clean a deep pocket at home?
It comes down to reach. In a classic study, careful brushing pushed the bristles as far as 0.9 mm below the gum edge (Waerhaug, 1981). The study used monkeys, so treat the number as a guide rather than a rule for your mouth.
Now do the arithmetic on a 5 mm pocket. Your brush reaches about the top millimeter, so the bottom 4 mm stays out of reach every night, however well you brush. That sheltered bottom, below the gum line, is where the bacteria Socransky mapped live.
This is also why your usual visit cannot handle it. The instruments in a routine visit work at and just under the gum edge, which suits a mouth with healthy 2s and 3s. Scaling and root planing works at the floor of the pocket, which is why we numb the area first. My post on what the treatment does inside the pocket walks through it step by step.
When is a deep cleaning of your teeth actually needed?
The American Dental Association notes that a pocket depth of 4 mm or greater is the most commonly recognized indicator for scaling and root planing. It also says dentists differ on the exact benchmark.
The European guideline on treating gum disease adds the second half. After treatment, you count as stable when no pocket is deeper than 4 mm and no 4 mm spot bleeds. Fewer than 10% of spots can bleed overall (Sanz and colleagues, 2020). So the line isn't one number. It's a deep number that bleeds, plus what your X-rays show about the bone.
Gum disease is staged from I to IV. The American Academy of Periodontology lists pockets of 6 mm or more as one factor that can place it at stage III (AAP chart). The stage is set mainly by how much attachment has been lost, so one deep number does not stage anything on its own.
It also does not have to be the whole mouth. The ADA codes this treatment per quadrant or partial quadrant, so a plan can include only the teeth whose numbers call for it.
What happens if I skip it?
The clearest answer comes from people who never had the choice. Löe and colleagues followed 480 tea plantation laborers in Sri Lanka from 1970 to 1985 (Löe et al., 1986). None of them had any dental care or did any brushing, and nearly all of their gums were inflamed. That makes them a picture of the disease left completely alone, not a forecast for someone who brushes and sees a dentist.
About 8% lost attachment fast, and by age 45 that group had lost all their teeth. About 81% progressed more slowly, and their tooth loss started after age 30. About 11% never went past inflamed gums.
Everyone in that study had the same missing care and the same heavy plaque, yet they ended up in three very different places. The study didn't test why. The part I pay most attention to is the host response: how your body responds to the infection. People who are genetically predisposed are at higher risk. You usually can't feel which group you belong to, because it often doesn't hurt until a tooth loosens.
That is why I measure instead of guessing, and it is where salivary testing comes in: an oral rinse that goes to a lab. The panel targets 11 of the several hundred bacterial types in the mouth. The same rinse reads your IL-6 genotype, sorted into high, moderate or low risk, which speaks to the host-response side. More in what your saliva reveals.
Bone lost to this disease does not grow back on its own, so treatment aims to stop the loss where it is.
What should I ask before I say yes?
Ask to see the chart: which teeth, how deep, and which ones bled. Then ask what the X-rays show about the bone. A plan built on deep, bleeding pockets and visible bone loss is treatment for a real disease.
If your numbers are 3 or under and nothing bleeds, you are below the ADA's 4 mm line. The routine preventive visit is the one you need. If they are deeper and bleeding, read how we treat periodontal disease here. For the longer background, see what is happening under your gums.
Periodontal disease is probably the condition that is most important when it comes to a patient's overall health. I want to be extremely transparent about my findings for you so that we can go on a journey of making you better.
Questions about a deep cleaning recommendation
Is one deep number enough to need treatment?
Not on its own. A single 4 mm spot that does not bleed is a different finding from a row of 5 mm spots that bleed every time. Ask which teeth, how deep, and which ones bleed.
Can I wait and see whether it settles down?
If the gums bleed but no attachment has been lost, that stage is gingivitis. The 2017 consensus says gums can return to health once it is treated (Chapple and colleagues, 2018). Once a pocket runs deeper than a brush reaches and bone is already gone, waiting does not reverse it.
If you were handed a set of gum numbers and left unsure what they meant, bring them in and we can read them together. I'm not in a rush. Our hours rotate, so call 702-732-3754 to confirm today's schedule, or book a visit online.