Advice on using accelerometers help children brush better

Dear Board,

I am new to the hardware game, but have a background in Business development and marketing.

Devices: Arduino uno R3 & Parallax MMA 7455 3-axis accelerometer.
Goal: To measure toothbrushing movement with an attachable device, and display that on an Android phone (using bluetooth) to reward patients and children for good brushing habits.

I've hooked up the arduino and the parallax (and checked using Blink). Now, I can't download any movement data.
Any other recommendations? I hope to build a working prototype within a month.

Thank you in advance!