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expiredNavy-Wife | Staff posted Aug 19, 2025 04:42 AM
expiredNavy-Wife | Staff posted Aug 19, 2025 04:42 AM

Grinest Rechargeable Cordless Water Dental Flosser w/ 6-Nozzles & U-Shaped Nozzle

$9.90

$40

75% off
Amazon
13 Comments 62,732 Views
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Deal Details
Grinest-Exclusive Store via Amazon has Grinest Rechargeable Cordless Water Dental Flosser w/ 6-Nozzles & U-Shaped Nozzle on sale for $19.80 - 50% off when you visit the promo code page to activate (or apply code H8I2KBN4 at checkout) = $9.90. Shipping is free with Prime or on $35+ orders.

Thanks to Deal Hunter Navy-Wife for sharing this deal.

Product Details:
  • The U-shaped flossing head surrounds teeth, directing dual water jets at inner and outer surfaces for complete coverage.
  • 3 adjustable treatment modes - Pulse, Normal or Gentle - with 4 pressure settings.
  • High-capacity battery that lasts up to 30 days on a single charge.
  • 350 ml water tank stores enough water for continuous flossing.

Editor's Notes

Written by ValPal2011 | Staff

Original Post

Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Grinest-Exclusive Store via Amazon has Grinest Rechargeable Cordless Water Dental Flosser w/ 6-Nozzles & U-Shaped Nozzle on sale for $19.80 - 50% off when you visit the promo code page to activate (or apply code H8I2KBN4 at checkout) = $9.90. Shipping is free with Prime or on $35+ orders.

Thanks to Deal Hunter Navy-Wife for sharing this deal.

Product Details:
  • The U-shaped flossing head surrounds teeth, directing dual water jets at inner and outer surfaces for complete coverage.
  • 3 adjustable treatment modes - Pulse, Normal or Gentle - with 4 pressure settings.
  • High-capacity battery that lasts up to 30 days on a single charge.
  • 350 ml water tank stores enough water for continuous flossing.

Editor's Notes

Written by ValPal2011 | Staff

Original Post

Community Voting

Deal Score
+55
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Top Comments

dealguy83
343 Posts
69 Reputation
I agree that accidental power on/offs occur with these but ehhhh…

Not that big of a deal.

They're only $10 and IMO they work great and are powerful.

Mine goes up to 10 in strength and I only use between 7-8 because it's strong enough.

Battery life is amazing too. Used it about a dozen times and still haven't needed to charge it.

Coslus is the brand name of mine.

13 Comments

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Aug 19, 2025 02:51 PM
2,491 Posts
Joined Feb 2005
Shock96Aug 19, 2025 02:51 PM
2,491 Posts
Good name! "Need to improve your grin? Go with Grinest!"
5
Aug 19, 2025 03:27 PM
138 Posts
Joined Dec 2023
iamjeffAug 19, 2025 03:27 PM
138 Posts
I've purchased and return this exact model.

The problem, at least for me, is that it's not ergonomically friendly.

The shape and I'd imagine the same with all the manufacturers since the shapes are very similar, is that it is very easy to turn it on when barely holding it.

I've sprayed the bathroom mirror and my face a number of times using it!!

Fortunately it was at a lower pressure, although you might change that accidentally, too.

I ordered and will try a portable version of this type of product.
1
1
1
Aug 19, 2025 11:02 PM
343 Posts
Joined Feb 2008
dealguy83Aug 19, 2025 11:02 PM
343 Posts

Our community has rated this post as helpful. If you agree, why not thank dealguy83

Quote from iamjeff :
I've purchased and return this exact model.The problem, at least for me, is that it's not ergonomically friendly.The shape and I'd imagine the same with all the manufacturers since the shapes are very similar, is that it is very easy to turn it on when barely holding it.I've sprayed the bathroom mirror and my face a number of times using it!!Fortunately it was at a lower pressure, although you might change that accidentally, too.I ordered and will try a portable version of this type of product.
I agree that accidental power on/offs occur with these but ehhhh…

Not that big of a deal.

They're only $10 and IMO they work great and are powerful.

Mine goes up to 10 in strength and I only use between 7-8 because it's strong enough.

Battery life is amazing too. Used it about a dozen times and still haven't needed to charge it.

Coslus is the brand name of mine.
3
Aug 20, 2025 01:47 AM
138 Posts
Joined Dec 2023
iamjeffAug 20, 2025 01:47 AM
138 Posts
Quote from dealguy83 :
I agree that accidental power on/offs occur with these but ehhhh…

Not that big of a deal.

They're only $10 and IMO they work great and are powerful.

Mine goes up to 10 in strength and I only use between 7-8 because it's strong enough.

Battery life is amazing too. Used it about a dozen times and still haven't needed to charge it.

Coslus is the brand name of mine.
That's the portable I just ordered, also $10 from SD!!
Aug 20, 2025 11:30 AM
209 Posts
Joined May 2009
Bugout78Aug 20, 2025 11:30 AM
209 Posts
This was much bigger than I thought it would be. Considering power washing the siding with it. Seriously if you are hurting for storage or counter space… this is fairly big.
Aug 20, 2025 12:20 PM
2,213 Posts
Joined Jan 2007
gullzwayAug 20, 2025 12:20 PM
2,213 Posts
I ordered this last time it was on here. Mine came without the u-shaped attachment in all the photos, as did others according to the Amazon reviews.

Submitted for an exchange, which is still pending 2 months later. Fortunately Amazon just gave me my money back and told me to keep it. Replacement is still showing pending on Amazon.
1
Aug 20, 2025 03:21 PM
1,911 Posts
Joined Sep 2011
jaqnaboxAug 20, 2025 03:21 PM
1,911 Posts
I thought the point of the cordless water flossers is so that you can use them in the shower. Prevents a mess being made.
1

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Aug 20, 2025 06:16 PM
5,386 Posts
Joined Mar 2005
TowHeadAug 20, 2025 06:16 PM
5,386 Posts
Quote from dealguy83 :
I agree that accidental power on/offs occur with these but ehhhh…

Not that big of a deal.

They're only $10 and IMO they work great and are powerful.

Mine goes up to 10 in strength and I only use between 7-8 because it's strong enough.

Battery life is amazing too. Used it about a dozen times and still haven't needed to charge it.

Coslus is the brand name of mine.
Mines still going strong on the original charge amazing value for $. I need the new nozzle tho.
Aug 22, 2025 01:33 AM
9,422 Posts
Joined Mar 2007
handyguyAug 22, 2025 01:33 AM
9,422 Posts
You can put all sorts of things in the reservoir
Aug 22, 2025 02:22 PM
206 Posts
Joined Jan 2010
asicshuAug 22, 2025 02:22 PM
206 Posts
Coupon is dead
Pro
Aug 22, 2025 04:31 PM
234 Posts
Joined May 2025
Dogspeonlegs
Pro
Aug 22, 2025 04:31 PM
234 Posts
All these basically the same. Works well. Little learning curve with button on/off sensitivity. I use 1/4th dilatured crest mouthwash in mine. Swish it around while going tooth to tooth. Funny little hack that works well. Mouthwash keeps the reservoir and tube from building up bacteria and other faucet water gunk, while also getting deeper clean in gums than just swishing around in mouth.
Aug 22, 2025 04:40 PM
962 Posts
Joined Jan 2008
BikemanAug 22, 2025 04:40 PM
962 Posts
Quote from asicshu :
Coupon is dead
Just placed an order. Got it for the deal price; used "visit the promo code page to activate" link posted in the original listing.
Aug 25, 2025 08:44 PM
537 Posts
Joined Jun 2014
TheDoctor34Aug 25, 2025 08:44 PM
537 Posts
The deal is dead, promo code is no longer valid.

However, there's limited time deal for $16.48.

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