We don't know you or your teeth.

But we do know two dental facts about you with near-certainty:

• You’re supposed to change your toothbrush every three months.

• You don’t change your toothbrush every three months.

No judgment if you don’t. Who does? The same people who formally eject thumb drives instead of just pulling them out. The same people who put their cellphones into airplane mode during takeoff. The same people who report their out-of-state purchases to their state sales tax authority.

Even if you have a fancy Sonicare toothbrush, where all you have to do is replace the head instead of driving to Walgreen’s to buy a whole new toothbrush, the new heads are, like, more than five freaking dollars apiece. Why do they charge so much? Because they can.

But it might be a different story if you had a supply of toothbrush heads sitting there - say, three years’ worth - that came with the toothbrush. And if more replacement heads were around two bucks.

That’s the deal here. This Pursonic Deluxe Plus does the whole 30,000-strokes-per-minute thing at a fraction of the cost of the Sonicare, and an even smaller fraction of the total cost of ownership for its lifetime. Along with the twelve replacement heads, it also includes a UV sanitizing chamber to rain sweet cleansing death upon any microbes foolish enough to take up residence in your bristles.

Sometimes the knockoff is the way to go, especially when it gets really good reviews. This Pursonic brush-and-heads package makes it easy to actually follow a dentist’s recommendations for once in your life. Just promise us you won’t start ejecting your thumb drives.