Do you need a dentist visit every 6 months? That filling? The data is weak
Briefly

Many common practices in dentistry lack solid data, such as the recommendation for biannual check-ups, as large trials show no benefit compared to longer intervals.
Evidence shows no benefit in scaling and polishing for adults without periodontitis, and filling cavities in baby teeth doesn't reduce pain or infections significantly
Read at Ars Technica
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