Every patient who moves to Boulder from another state asks the same question in the chair: is six months a real number, or a habit? The honest answer is that it is a starting point — and for about a third of our patients it is the wrong one in either direction.
Where “twice a year” came from
Six-monthly recalls were not handed down from a clinical trial. They spread through mid-century insurance schedules and a famous toothpaste campaign, and they stuck because they are easy to remember and easy to administer. That does not make them wrong — it makes them average.
Two cleanings a year suits a majority of healthy adults. It is a poor fit for anyone with active gum disease, and more often than needed for a small group of very low-risk patients.
What actually decides your interval
When we set a recall interval we are looking at five things, and none of them are your age:
- Gum pocket depths. Anything consistently over 4mm changes the schedule immediately.
- Bleeding on probing. The single most useful early signal we have.
- Plaque and calculus build-up between visits. Some people simply mineralise faster.
- Smoking, vaping, diabetes and pregnancy. All shift gum disease risk upward.
- Grinding and dry mouth. Often medication-related, and often missed.
Three risk groups, three schedules
Most major PPO plans cover two cleanings per benefit year, and many cover more when a periodontal diagnosis is on file. If you are in the high-risk group, that paperwork matters — we file it for you.
What you do at home changes the number
A patient who flosses reliably and uses an interdental brush can often move from six months to nine. The reverse is also true, and there is no judgement in it: if flossing is not going to happen, we would rather see you more often than pretend otherwise.
How we set your interval here
At your exam we chart pocket depths, photograph problem areas and score plaque. You get a number and the reasoning behind it, in writing. We revisit it every year — intervals should move as your mouth changes, and they often do after a course of gum therapy.
If you have been on a six-month schedule for a decade without anyone explaining why, that is worth a conversation. Bring your last set of X-rays and we will talk it through.