Philips Sonicare Diamond Clean Toothbrush

Absolutely the best toothbrush I’ve ever used (and the top toothbrush recommended by my dentist!), but this wonder really stole my heart when I discovered how well it travels.  Since we all clearly have enough chargers to travel with, this toothbrush doesn’t have to be charged at all during your trip (unless you're away longer than two weeks).  Just fully charge it the night before your flight, and you’re good for the duration.  How you fill the extra space in your bag is up to you.  I’d go with accessories.