Introduction
Tools
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Look for the black screw covers near the top of the brush. Take the covers off with flat head screw driver.
 
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Using your flat head screwdriver to go along the seams of the plastic shell till the shell pops apart.
 
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Then take your Philips screw driver (ph1 size head) and unscrew the circuit board. The screw is located in the middle of the board.
 
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Remove the black heater cover by sliding it off.
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Desolder each of the four connections, and remove the circuit board.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.