Why Clinics Find Different Numbers of Cavities: Differences in Diagnostic Criteria and How to Check

Why does each clinic find a different number of cavities?

Because dentists can have different thresholds for whether an early lesion should be “treated now” or “monitored” [1]. Tooth decay progresses along a continuum, and an early lesion confined to the enamel may be filled right away or monitored with fluoride application and care, so there is a range in diagnostic criteria [1]. Even with the same X-rays, judgments about when to treat can differ, so different numbers may be given, and this is often a difference in criteria rather than proof that one side must be wrong [1].

When DentStat analyzed about 2,200 patient comments on overtreatment and distrust of dentists from YouTube dental content, confusion such as “every clinic gives a different diagnosis, so I don’t know what to believe” and questions seeking ways to check appeared repeatedly [3].

Does it help to get diagnoses from several clinics?

Comparing diagnoses from several clinics is used especially when a large non-covered treatment (not paid by Korea’s National Health Insurance) is proposed [1]. Because diagnoses can naturally differ due to the differences in criteria described above, some patients line up the diagnostic basis and treatment scope each clinic presents and judge side by side [3]. It is mentioned that for small, mostly covered procedures there is little benefit in visiting several clinics each time, while the benefit of comparison grows for non-covered treatment plans that handle many teeth at once [3].

How can I tell if the care is trustworthy?

Whether the dentist explains the diagnostic basis and also presents options that save the natural tooth are mentioned as criteria [1]. Points to check are whether the dentist shows evidence such as X-rays and intraoral photos to explain why a treatment is needed, and whether an approach that saves as much tooth as possible is also presented [1]. On the other hand, it has been pointed out that appearances such as having treatment coordinators, the interior or the number of reviews are hard to treat as direct proof that the care is appropriate, and rather than judging good or bad from one such clue, checking the diagnostic basis itself is suggested [3].

Does a root canal save the nerve?

No. A root canal removes damaged or infected pulp (nerve) and disinfects and fills the inside of the tooth [1]. Many misunderstand it as “saving the nerve,” but the purpose of treatment is not to revive a damaged nerve; it is to keep the tooth itself instead of extracting it [1]. Cases where this confusion over terms led to the misunderstanding “why did you kill my nerve?” were repeatedly seen in the comments [3].

What can I do if I feel my tooth was drilled without my consent?

Explanation and consent before treatment are basic steps of care, so it is important to have the planned treatment scope explained and confirmed in advance [2]. If you feel tooth was removed beyond what was planned, records such as medical certificates, X-rays and treatment records become the basis for later judgment [2]. Rather than ending as a personal quarrel, medical disputes can be taken to specialized bodies such as the Korea Medical Dispute Mediation and Arbitration Agency for consultation and mediation, and since legal judgments vary by case, expert advice is needed [2].

Common misconceptions and the facts

• Myth: “If a clinic has treatment coordinators, it overtreats.” → Fact: Staffing itself is not a basis for judging whether care is appropriate; the diagnostic basis and whether conservative options are explained are mentioned as criteria [3].
• Myth: “Avoid anyone who is not a board-certified specialist.” → Fact: Specialist certification and the appropriateness of individual care are separate matters; certification alone does not determine the content of care [3].
• Myth: “If diagnoses differ, one side is a scam.” → Fact: Decisions to treat or monitor early lesions can differ by criteria, so comparing the diagnostic basis is mentioned as the way to check [1].

Cavity diagnosis and treatment in general are covered in the cavity guide, basic principles for using dental care in the dental care and oral hygiene basics guide, and regional clinic data in Find a dentist.