Waterpik Water Flosser WP-660K Ultra Professional

Follow these instructions on how to use a Waterpik® Water Flosser:

1. Fill the reservoir with warm water and place firmly on the base.
2. Select a tip and click into the handle. (Note: If this is the first use, set the pressure control dial to high. Point the tip into the sink and turn on until water flows. Turn the unit off.)
3. Start with the lowest pressure setting, lean over the sink, place tip in your mouth.
4. Turn unit on. Close lips enough to prevent splashing, let water flow from your mouth into sink.
5. Aim the tip at the gumline.
6. When finished, turn unit off and use the tip eject button to remove the tip.

Depending on the Waterpik® Water Flosser model, you can use the in-handle pause or on/off switch to stop water flow if needed. You can also aim the tip using the rotating base. (These features are not available on all models.)

Learn how to clean your Water Flosser in 5 easy steps.

Step 1: Clean the outside of the unit.

Clean the outside of the product when necessary by using a soft cloth and mild non-abrasive cleanser.

Step 2: Clean the water reservoir.

• Remove the water reservoir from the unit. (Refer to your product manual if you need assistance).
• If using a countertop model that contains a small black reservoir valve, remove the valve by pushing on it from the bottom. Clean the valve by massaging it under warm water for 30-45 seconds and set aside.
• Place the reservoir in the top rack of your dishwasher for cleaning. We recommend air drying instead of a heated dry cycle.
• If you removed a valve, place it back in the reservoir before use. (Dome side up, push in place so the four prongs are visible on the bottom of the reservoir.)
• Reservoirs can also be hand washed with warm soapy water.

The reservoir is top-rack dishwasher safe.

Step 3: Clean the internal parts.

• Based on your model, mix 1-2 tablespoons of white vinegar with 16 ounces of warm water.
• Run this solution through the unit until the reservoir is empty.
• Rinse by repeating with a full reservoir of clean warm water.

Mix white vinegar with a full reservoir of warm water and run the solution through the unit.

Step 4: Clean the handle (for countertop models)

• Remove the tip from the unit using the eject button.
• Soak the Water Flosser handle in a mixture of 2 parts water, 1 part white vinegar for 5-7 minutes.
• Rinse the handle under warm water.
• Clean the Water Flosser tip separately using step #5.

Soak the handle of countertop units in vinegar/water mixture for 5-7 minutes.

Step 5: Clean the flosser tip.

• Remove the tip from the unit using the eject button.
• Soak the Water Flosser tip in a container of 2 parts water, 1 part hydrogen peroxide or white vinegar for 5 minutes.
• Rinse the tip under warm water.
• For maximum effectiveness over time, we recommend replacing Water Flosser tips every 3-6 months. The tips can become clogged and/or affected by mineral deposits.

Soak the flosser tip in vinegar/water mixture for 5 minutes.

Complete this process every 1-3 months to ensure optimal performance.

Plug the power supply into the wall outlet and connect the magnetic plug to the unit for approximately 4.5-5 hours. When the batteries are in need of charging the charge indicator light will blink 3 times quickly. A complete recharge will take 4.5-5 hours.

Waterpik® cordless models are shower safe.

For first time use, prime the unit:

If your unit has a black rubber valve in the water reservoir, ensure that the black valve is installed with the dome side facing up and the four-pronged side facing down to connect with the base of the unit.

Fill reservoir at least half-full of water. Ensure the reservoir is firmly seated onto the base of the unit. Press down firmly to engage the reservoir to the base of the unit.

Confirm the unit is plugged into an active electrical outlet.

Set the Water Flosser to the highest pressure setting, and if the handle has an on/off slide switch, make sure it is in the ON position. Then point the handle downward towards the sink and turn the unit on; this generally starts the flow of water within 30 seconds.

If this process fails to start the flow of water, insert a jet tip and gently draw on the tip as you would a drinking straw.

Drop in pressure or flow:

It is recommended that when applicable, you replace tips every 3-6 months. (Consult the instruction manual for specific replacement information for each tip.)

Add 2 tablespoons of white vinegar to a full reservoir of warm water.

• If your tip is removable, remove the tip, set pressure control dial to high, place the handle in the sink.
• With the unit in the OFF position, allow gravity to drain the vinegar solution through the Water Flosser.
• Rinse by repeating with a full reservoir of clean warm water.

Water Flosser products are not intended to store liquid between uses - ensure your product is emptied after each use.

If your unit has a black rubber valve plugging the bottom of the reservoir tank:

• Remove the black rubber valve from the water tank by pushing it out from the bottom.
• Run the valve under warm water and massage with your fingers.
• Return the black valve to the tank. Ensure the dome side is facing up and the four-prong side is showing on the bottom.
• If the valve continues to leak, you may need to replace it. For additional details, see our Reservoir Valve Article.

Mouthwash or other recommended antibacterial solutions can be used in our Water Flossers.

We recommend using no more than a 1:1 ratio of solution to water. After using additives, run at least one-half reservoir of plain water through the unit to flush the water pathway.

Do not use mouthwashes or additives that contain iodine, peroxide, baking soda, or water-insoluble concentrated oils (such as Tea Tree Oil). Use of these items can reduce the product performance and will shorten the life of the unit

Do not use a salt/saline solution in any handheld cordless unit. If additives are being used, it is highly recommended that the cleaning procedure is done at least once a month.