I just used this unit for the first time yesterday evening. The unit quietly hums but there is no movement of the water. Is the unit defective?

You don't see movement. However, put one finger in the unit while it is on and you should notice the vibrations. If you don't, then something is wrong. But just looking at it, no, the water doesn't move.

Can this be used with a flex denture? I can't use toothpaste, mouthwash or cleaning tablets because the denture will change color.

I use it on my flex bridge with Val-Clean made for this type of denture. Buy it at valclean.com for ½ the price on Amazon. I've been using it for many years now. They get clean and still flexible.

When this item is used to clean a night guard, should it be used every day? I typically just brush my night guard with my toothbrush & toothpaste every morning, but do a weekly soak in a glass with denture cleaner. Do you add any sort of cleaning agent when using this item? Thanks!

I use mine for my night guard. My dentist says all of these 'expensive' cleaners are unnecessary. Use distilled water and 1/4 teaspoon of baking soda and clean your retainers or dentures every night. I do this and once a week I brush my retainers with my toothbrush... they have been very clean and undamaged for years. Saves money and it works... I like a win-win.

Has anyone owned this for over 2 yrs. From the review, it breaks down too easily. Anyone know model that will last me more than 5 yrs for

I bought mine July 2018, and it broke Oct 2020. I didn't use it frequently either. It does a great job but isn't durable. So, based on my experience, it will not last even 2 years.

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iSonic F3900 Ultrasonic Denture/Aligner/Retainer Cleaner for All Dental appliances (Machine Only)

iSonic F3900 Ultrasonic Denture/Aligner/Retainer Cleaner for All Dental appliances (Machine Only)

Product ID: 1420175

Details

Brand
iSonic
Power Source
Corded
Product Benefits
Deep cleans
Special Feature
Timer
Unit Count
1 Count

🔊42 kHz ultrasonic cavitation

⏲️5-minute auto-clean cycle

⚙️200 ml stainless steel tank

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R1753

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

✨ Keep your smile flawless with ultrasonic precision! ⚡

COMPACT POWERHOUSE - Sleek 200 ml stainless steel tank fits all daily dental essentials for quick, deep cleaning sessions.
ONE TOUCH SIMPLICITY - Touch-sensing control activates a 5-minute auto-clean cycle—set it and forget it for hassle-free hygiene.
PEACE OF MIND INCLUDED - FSA/HSA eligible with a 1-year warranty and responsive US-based support, because your smile deserves the best.
BUILT TO LAST LEAK FREE - Durable, hard-wired design with a non-removable tank guarantees long-term reliability and minimal upkeep.
EFFORTLESS PRECISION CLEANING - 42 kHz ultrasonic waves reach every nook without scratching, ensuring your dental appliances are impeccably spotless.

The iSonic Ultrasonic Cleaner (F3900) delivers professional-grade, non-abrasive cleaning for dentures, aligners, retainers, and sleep apnea devices using 42 kHz ultrasonic cavitation. Its compact 200 ml stainless steel tank and intuitive one-touch 5-minute cleaning cycle make daily dental hygiene effortless. Designed for durability with a leak-free, hard-wired tank, it offers reliable performance backed by a 1-year warranty and US-based customer support. Ideal for busy professionals seeking a quick, thorough clean that fits seamlessly into their routine.

Specifications

ASIN	B00HLBW61C
ASIN	B00HLBW61C
Additional Features	Timer
Best Sellers Rank	#26,694 in Health & Household ( See Top 100 in Health & Household ) #57 in Denture Cleansers
Brand Name	iSonic
Color	Machine Only
Customer Reviews	4.2 4.2 out of 5 stars (5,551)
Global Trade Identification Number	00804879261940
Included Components	plastic tray, sample iSonic White denture cleaning crystal, iSonic AlignerClean
Is Discontinued By Manufacturer	No
Item Dimensions	7.1 x 5 x 5 inches
Item Weight	2 Pounds
Item model number	F3900
Manufacturer	iSonic
Manufacturer	iSonic
Manufacturer Part Number	F3900
Manufacturer Warranty Description	One-year warranty for parts and labor. Customers within the continental USA pay one-way shipping, customers outside of continental USA pay 2-way shipping for warranty repairs., Only Amazon and Joy4Less are our authorized dealers on Amazon for this product. Purchasing from unauthorized dealers voids the warranty automatically.
Material Type	Electronics, Plastic, Stainless Steel
Model Name	isonic_f3900
Model Number	F3900
Power Source	Corded Electric
Product Benefits	Deep cleans dentures, aligners, retainers, night guards, mouth guards etc.
Product Dimensions	7.1 x 5 x 5 inches; 2 Pounds
Recommended Uses For Product	Daily Cleaning, Deep Cleaning
Tank Volume	0.2 Liters
Target Use Body Part	Teeth
UPC	662712236087 804879261940
UPC	662712236087 804879261940
Unit Count	1 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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