Introduction
Tools
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            Invert the toothbrush and apply pressure against the metal tip until the internals and casing separate. 
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            Remove the internals from the casing. 
 
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            Separate the upper and lower components by sliding the circuit board section and motor section away from each other. 
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            Remove the spring. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.