My Face ID stop working after a little water

Your phone has water damage, you may be looking at a replacement.

Make an appointment at the Genius Bar to have it diagnosed.

Genius Bar Reservation and Apple Support Options - Apple

BHBianca Said:

"My Face ID stop working after a little water: Little water got on my front camera everything works but the Face ID"

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Troubleshooting Face ID After Water Issues:

A. Extracting Water:

Take this to a local retailer. Many retailers have devices designed to extract water from a mobile phone. Local one in my rural area do, and I've used one myself

B. Overview these Two Links:

• If an Alert Says Face ID has been Disabled on your iPhone or iPad Pro - Apple Support
• If Face ID isn't Working on your iPhone or iPad Pro - Apple Support