This study reports a follow-up on 2415 occlusal sealings performed in a dental office. After nine to ten years service time, the survival rate of all sealed surfaces dropped to 69.5% because of either occlusal or interproximal carious activities. Retention of the sealings was intact in 91.5% after one year, but dropped to 58.2% after nine years. In the control group 49.3% of the grooves showed either caries or fillings during the last check-up whereas this occurred in only 7.3% of the sealed teeth (ratio 7:1). The difference among those two groups was even bigger (45.7% vs. 5%, ratio 9:1) when excluding all two-sided fillings. The costs of restoring one tooth surface in the control group was on average two to three times higher than for the sealings group. There is no doubt about the beneficial prophylactic effect of the use of sealants, even in the context of the private dental office, and no inconvenient side-effects have been found. The results concerning the retention rate of sealing in this study from a private dental office are comparable with the average of those reported in many papers from U.S. Dental Schools, they are even slightly better for the caries incidence.