he wand end in your mouth, make sure the switch on the wand is turned on (I leave mine turned on), turn the power button on, start at a back molar and work your way forward, keeping your head tilted forward and lips puckered so the water pours out into the sink.
Efficacy - More effective and faster than flossing. At least that's what the internet says, but here's my point: I never would floss, but this is so easy and quick I can do it every night with no worry. It also leaves your mouth feeling refreshed and rinsed before you brush and mouthwash.
Oral Hygiene - The water pushes bacteria and food particles out, effectively doing the same job as flossing and mouthwashing. It also helps promote periodontal health by stimulating circulation in your gums, which can help them to heal faster and fight infections better.
No pain or bleeding if you just start, unlike flossing. Just start on the lowest sensitivity and work your way up.
Multiple Options - With various heads so you can actually brush your teeth with it, use different spray types, and the pulsating massage mode for massaging gums.

CONS:
Expensive, especially compared to floss.
The on/off switch is difficult to change with one hand. This doesn't affect me though as I leave it on and just use the power button on the machine to start and stop water flow.
Can be loud, if you're trying to floss while others are asleep.
Not portable like floss is. Even if you get the handheld version (terrible idea) you have to dispose of the water, so you can't floss while you read or watch TV like with standard floss.

TIPS:
Putting a washcloth or grip pad (like what you line cabinets with or what you open the pickle jar with) under the unit to help lower the vibrations
Once a month do a cleaning rinse: Clean the basin out with vinegar, allowing it to soak for an hour and put the wand tips in with it - this will kill odor causing germs. Pour that out and do a full hot water rinse to get the vinegar out, then do a hydrogen peroxide rinse. The peroxide will kill any mildew spores inside the tubing.
Don't leave water in the basin, or put any non-liquid or sticky additives in. I've put mouthwash in before as a rinse aid, but that's it. You don't want stuff clogging the tubing.

UPDATE: After over two years it's still performing like new, staying clean inside and out, and my teeth have never been healthier! I've also not seen any signs of leaking like others have experienced. The only time I get water on the counter is if it runs along the hose and drips off.

优点：

易于使用 - 加入温水或混合有漱口水的水（都用同样的量稀释在水中的漱口水），然后选择强度和头部附件，将冲牙器端部放入口中，确保它的开关是开着的（我的一直都是开着的），打开电源按钮，从后面的臼齿处开始向前走，保持头部向前倾斜一点，嘴唇卷起一点，让水注入水槽。

功效 - 比牙线更有效，使用起来也更快。至少就是像网上所说的一样，但这里是我的观点：我从来没有使用过牙线，但是这个过程非常简单快捷，我可以每天晚上使用，不用担心。在你刷牙和漱口之前，它也会使你的口腔感觉清新和干净。

口腔卫生 - 水可以将细菌和食物残渣排出，一样可以发挥出牙线和漱口水的效果。它也有助于保持牙周的健康，促进牙龈健康的循环，这还可以帮助受伤的口腔更快愈合，更好地对抗感染。

如果你刚刚开始就没有疼痛或流血，不像使用牙线一样的话。那就从最低的灵敏度开始尝试，会越用越习惯的。

多种选择 - 使用不同的端部，所以你可以用它来刷牙，可以使用不同的喷雾类型，还可以使用按摩牙齿的按摩模式。

缺点：

价钱太贵啦，特别是和牙线比起来。

一方面是开关比较难控制。但是这其实并不影响我，虽然我一直只是用机器上的电源按钮来启动和停止水流出。

如果你正在别人睡觉的时候使用这个产品，可能会有点吵。

这个不像牙线是便携式的。即使你拿到很方便的手持版（想起来也有点吓人），你也会把水洒出来，所以当你在看书或者看电视的时候，不可能很好的使用它。

提示：

把一块毛巾或夹子垫子（比如你放在柜子里面的或用在打开腌菜罐子的地方的）放在设备的下面，就可以降低振动了

每月记得要有一次的清洁冲洗：用醋来清洗盆，把冲牙器的一端放进去，让它浸泡一小时，这将杀死细菌，也可以除去它们引起的气味。之后拿出来，用热水冲洗，把醋给洗赶紧，然后用过氧化氢来冲洗。过氧化物将杀死管内的所有霉菌孢子之类的。

不要把水放在盆里，或者放入任何非液体或着很粘的添加剂。我之前已经把漱口水拿来作为漂洗的清洁剂，但就是不应该用它来清洗的。你肯定不想让这些东西堵塞你的冲牙器管道。

追评：用了两年，它仍然像新的一样，里面外面都很干净，而且我的牙齿已经非常健康了！我也没有看到像其他人经历过的那些像液体泄漏的迹象。唯一有一次是我在柜台上拿水的时候，它沿着软管流下来了。