Jack Guo practices endodontics in O Fallon, MO at 113 Church St, O Fallon, MO 63366. National Provider Identifier 1669110599, registered with CMS on May 20, 2022. Phone 6363624040. No Google rating has been collected for this location yet. DentalPeach Score 67 out of 100, calculated from 1 measured component (see /how-we-score).
Peach Score
67 / 100 · Solid
Findability and upkeep: 67/100 (weight 20) — phone on file, federal record updated within 5 years
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Source: NPPES record for NPI 1669110599, last updated in the federal file on July 16, 2026. A federal record can lag a move or a retirement — call before you go.