Oral-B 3765 - User Manual

Questions and Answers

E
evansshaneAug 8, 2025
Why is my Oral-B Electric Toothbrush handle not charging?
- R
  rzamoraAug 8, 2025
  Your Oral-B Electric Toothbrush handle might not be charging because the battery is at a very low level, and it may take 10-15 minutes until the display turns on. Also, the ambient temperature might be out of the valid range (less than 0°C or greater than 40°C), or the charger may not be properly connected. To resolve this, charge the handle for at least 30 minutes. It is recommended that the ambient temperature for charging is 5°C to 35°C. Also, ensure the charger is connected to the mains voltage.
C
Chad LeblancAug 19, 2025
Why does my Oral-B 3765 Electric Toothbrush make rattling/loud noise during brushing or turning on?
- K
  Kevin AllenSep 12, 2025
  The rattling or loud noise during brushing or turning on your Oral-B Electric Toothbrush may be due to the brush head not being placed correctly onto the brush handle, or the brush head may be worn. Check that the brush head fits properly on the handle, noting that a small gap remains in between. If the brush head is worn, replace it.
P
paul35Aug 27, 2025
What to do if my Oral-B Electric Toothbrush handle is not operating during first use?
- J
  Jill HuangAug 27, 2025
  If your Oral-B Electric Toothbrush handle is not operating during the first use, it could be due to a very low battery charge or operating outside the standard temperature range. If the battery has a very low charge, charge it for at least 30 minutes. Always operate the toothbrush in standard operating temperatures (greater than 0°C and less than 40°C).

Summary

Important Safety Guidelines

Product Integrity and Usage

Checks for damage, intended use, and safe operation.

Child Safety and Supervision

Guidelines for children's use and the need for supervision.

Warnings

Electrical and Water Hazards

Precautions related to electricity, water, and wet hands.

Cord and Battery Safety

Safety measures for power cords and internal batteries.

First Use Procedure

Charging and Operating Instructions

Using Your Toothbrush

Timer and Feedback Features

Smart Pressure Sensor

Sensor Functionality and Indicators

Explanation of the sensor's operation and color codes.

Brushing Modes and Settings

Smartphone Connectivity

Connecting to Oral-B App

Guarantee and Warranty

Warranty Coverage and Limitations

Bluetooth Module Information

Troubleshooting Guide

Resolving App and Connectivity Issues

Solutions for problems with the Oral-B App and smartphone connection.

Addressing Toothbrush Operation Issues

Troubleshooting common problems with the toothbrush's functionality.

Performing a Factory Reset

Oral-B 3765 Specifications

General

Brand	Oral-B
Model	3765
Type	Electric Toothbrush
Charging Time	12 hours
Waterproof	Yes
Power Source	Battery
Features	Pressure Sensor
Brushing Modes	Daily Clean, Gum Care, Sensitive, Whitening
Included Accessories	Brush Head
Timer	2-minute timer with 30-second intervals