After water Face ID not working

https://support.apple.com/en-us/HT207043

To prevent liquid damage, avoid these:

• Swimming or bathing with your iPhone
• Exposing your iPhone to pressurized water or high velocity water, such as when showering, water skiing, wake boarding, surfing, jet skiing, and so on
• Using your iPhone in a sauna or steam room
• Intentionally submerging your iPhone in water
• Operating your iPhone outside the suggested temperature ranges or in extremely humid conditions
• Dropping your iPhone or subjecting it to other impacts
• Disassembling your iPhone, including removing screws

turn your device completely off and let it dry for a few days. you may have ruined our device by submerging it in liquid.

You've destroyed the device.

Water damage can not be repaired and the device must be replaced.

Rickybains1958 wrote:

Just clicked few picks in water - Face ID stopped working

iPhones are not waterproof. They are water resistant.