An electric toothbrush. Your teeth will feel cleaner, and apparently these toothbrushes have been "proven" to do a better job. I now dislike using the normal toothbrushes, eg when travelling.

I am currently using this one, bought for $49 not $199 on Groupon, cleans great and wireless recharging is great, but seems to have a design fault - I only managed to replace the head by wrecking the old one, will replace with a different brand.