That Daily Deal offers the WaterPik Nano Sonic Electric Toothbrush in Soft Brush for $4.99 with free shipping. That's tied with last week's mention and the best price we could find today by $4. Deal ends May 26. Buy Now Tips It requires one AAA battery, which is included. You can buy 3 or more to drop the price to $3.99 per brush. Features 16,000 strokes per minute