Slate Flosser Not Charging? Fix Common Charging Issues

Quick answer

If your Slate flosser is not charging, first check the USB-C power cord and the charging port for debris or damage. Try a different USB power source and outlet. If it still doesn't charge, the battery may need replacement. If the battery is not holding a charge after a full charge, contact Slate support for further diagnosis.

Check the charging connection

Start by inspecting the USB-C port on your Slate flosser. Dust, toothpaste residue, or lint can block the connection. Use a dry, soft brush or a wooden toothpick to gently remove any debris. Never use metal objects or liquids.

Next, examine the USB-C power cord for signs of wear, such as fraying or bent connectors. Try a different USB-C cable that you know works with other devices. Also, plug the cord into a different USB power adapter and wall outlet to rule out a faulty power source.

Test with a different power source

Sometimes the issue is not with the flosser but with the power adapter. Slate flossers are designed to charge via USB-C, so you can use a standard 5V USB adapter. Avoid fast-charging adapters that may deliver higher voltage, as they could damage the battery. If you have a computer or power bank, try charging from that USB port to see if the flosser responds.

Inspect the charging port and cable

Look inside the charging port with a flashlight. If you see corrosion, bent pins, or a loose connection, the port may be damaged. In that case, do not attempt to repair it yourself. Contact Slate support for repair or replacement options. If the port looks clean and the cable is fine, the problem may be internal.

Battery not holding charge

If your Slate flosser charges but loses power quickly, the battery may be nearing the end of its life. Lithium-ion batteries degrade over time, typically after 2–3 years of regular use. You can try a full charge cycle: charge until the indicator shows full, then use until it stops. Repeat this a few times. If the runtime remains very short, the battery likely needs replacement.

When to stop and seek help

If you have tried multiple cables, power sources, and cleaned the port, but the flosser still does not charge, stop troubleshooting. Further attempts could damage the device. Contact Slate customer support for a diagnosis or battery replacement. Do not open the flosser yourself, as this may void the warranty and expose you to safety risks.

Diagnosis: match your symptom to the fix

• No charging indicator light: The flosser shows no sign of charging when plugged in. Likely cause: faulty cable, adapter, or charging port. Corrective action: try a different USB-C cable and power source. Clean the port. If still no light, the port may be damaged. If the port is damaged, stop and contact support.
• Charges but battery drains quickly: The flosser charges fully but loses power after a short use. Likely cause: degraded battery. Corrective action: perform a full charge cycle a few times. If runtime remains short, replace the battery. If battery replacement is needed, consider a new flosser bundle.
• Intermittent charging: The flosser charges only when the cable is wiggled or held at an angle. Likely cause: loose charging port or damaged cable. Corrective action: try a new cable first. If the issue persists, the port may need repair. Do not force the cable; seek professional repair.

Products that support your flosser

• Dental Hygiene Kit: Dental Hygiene Kit includes FLOSSPASTE, a low-abrasion floss serum with .24% fluoride, nano-hydroxyapatite, and pH+ technology. Using the right floss paste can complement your flosser and support oral health, but it won't fix charging issues.
• Floss Head Cover - Mint: Floss Head Cover protects floss heads from dirt, dust, and debris. Available in multiple colors. Keeping floss heads clean is important, but this accessory does not affect charging.
• Slate Flosser x Vanilla Fygg Varnish: Slate Flosser x Vanilla Fygg Varnish bundle includes a rechargeable electric flosser, floss heads, USB-C cord, and a tube of nano-hydroxyapatite varnish. If your current flosser is beyond repair, this bundle offers a complete replacement with a new flosser and charging cord.