The Oral-B rechargeable electric toothbrush is definitely the best investment I have ever made.  I have always dreaded my 6 month check-ups with the hygenist at my Dentist's office but since I bought the Oral-B my problems with plaque build-up are gone.  It has a timer to tell you when your two minute brushing time is up and it holds a charge up to two weeks.  The charger is small enough to pack for vacations and the brush head is very easy to change.  There are different brush heads available for whatever your dental needs are.  I highly recommend this product.