How it works

1

Become friends in the app

Open FlossBros, go to Friends, and add each other. The friendship has to be accepted by both of you on or before October 1, 2026.
2

Both of you register below

You each fill in the form separately, using your own FlossBros account email and your partner's. Your pair is confirmed when both entries match — that way nobody gets signed up without knowing.
3

Floss and log it, on the day

Tap Log Floss in the app each day. A day counts only if you logged it on that day — see the honest note below.
4

We check, then we ship

After December 6, 2026 we verify both accounts. If you both hit 100 qualifying days, we email you for a shipping address and order your kit from your local Amazon store.

The one rule that matters: log it the same day

FlossBros lets you catch up on missed days — 7 days back on the free plan, 90 days back on Premium. That feature still works normally, and it still fixes your streak.

But catch-up days do not count toward this challenge. Every floss log carries a server-side timestamp recording when it was actually written, which is separate from the day it's assigned to. We count a day only when those two match. So a day you fill in later still helps your streak — it just won't count here.

We're telling you this up front because we can check it, and we will.

Register your pair

Both of you need to submit this form, each from your own side. Registration closes October 1, 2026. Days you already logged inside the window still count.

Check the arithmetic first: with 84 days left you need 16 same-day logs already banked to reach 100. Both of you.

Key dates

August 19, 2026: Challenge window opens. Logged days start counting.
October 1, 2026: Last day to register your pair, and last day for the friendship to be accepted.
December 6, 2026: Challenge window closes. Last day that can count.
By December 20, 2026: We finish verification and email everyone who qualified.
January 15, 2027: Deadline to send us a shipping address.

Questions

Do I need Premium?

No. The challenge is free to enter and free to win. Premium changes nothing about whether you qualify — and Premium's 90-day catch-up window doesn't count toward the challenge either.

What if my friend drops out halfway?

The gift is per pair, so you'd both miss out. You can register with a different friend instead, as long as you do it before October 1, 2026 and that friendship is accepted in the app by then. One partner per person.

What if I miss a day?

You're fine. The window is 110 days and you need 100 of them, so there's room for 10 missed days. They don't have to be consecutive.

What exactly is the gift?

An eco-friendly flossing kit — typically bamboo or corn-fibre floss picks, refillable silk floss, and a travel case, worth roughly €20. We buy it from the Amazon store in your country, so the exact contents vary by market.

What happens if more than 50 pairs qualify?

Gifts go to the first 50 pairs in the order they reached their 100th qualifying day, measured by our server timestamps. There's no random draw. If you're past the cap we'll tell you.

What data are you looking at?

Only what's already in your FlossBros account: whether you two are accepted friends, and the dates and server timestamps of your floss logs during the window. We don't read your notes, symptoms, or anything else.

Official Rules

FlossBros Friends Bonus Challenge · Last updated August 19, 2026

Change log · September 14, 2026: a reachability notice was added to the top of the page and above the registration form. The Official Rules below are unchanged.

1. Sponsor

This challenge is sponsored and administered solely by FlossBros (help@flossbros.app). Apple Inc. is not a sponsor of this challenge and is not involved in it in any way. Google LLC is not a sponsor of this challenge and is not involved in it in any way. Amazon is used only as a retailer for fulfilment and is not a sponsor.

2. No purchase necessary

No purchase or payment of any kind is required to enter or to receive a gift. A FlossBros Premium subscription neither improves nor is required for your chances. There is no element of chance: every eligible pair that meets the requirements receives a gift, subject to the cap in section 7.

3. Eligibility

You must be 18 or older at the time of entry.
You must hold a FlossBros account registered before October 1, 2026.
Open worldwide except where prohibited or restricted by law. The challenge is not open to residents of Italy, the province of Quebec (Canada), or Brazil, and not open in territories subject to applicable trade sanctions.
Employees of FlossBros and their immediate households are not eligible.
One entry per person, in one pair only.

4. How to enter

You and one friend must be accepted friends in the FlossBros app, with the friendship accepted by both sides on or before October 1, 2026.
Each of you must separately submit the registration form on this page on or before October 1, 2026, giving your own account email and your partner's.
A pair is registered only when both submissions exist and name each other. A one-sided submission is not an entry.

5. Qualifying

The challenge window runs from August 19, 2026 through December 6, 2026 inclusive (110 calendar days, measured in your device's local time zone).

A day is a qualifying day if a floss log exists for that date in your account and the server-side creation timestamp of that log falls within the same local calendar day. Logs created after the day they are assigned to — including any use of the app's catch-up or backfill feature, on the free or Premium plan — do not count as qualifying days.

A pair qualifies when both members have at least 100 qualifying days within the window, and the friendship between them is still accepted on December 6, 2026. Qualifying days need not be consecutive.

6. Verification

FlossBros will verify entries against its own server records: friendship status and acceptance timestamps, and the dates and server creation timestamps of floss logs within the window. FlossBros may disqualify any entry it reasonably believes to involve duplicate, automated, or bad-faith accounts, including where both accounts in a pair are operated by the same person. Decisions on verification are final.

7. Gift and cap

Each member of a qualifying pair receives one eco-friendly flossing kit with an approximate retail value of €20 (or the nearest local equivalent). Contents vary by country because the item is purchased from the Amazon store serving your delivery address. FlossBros may substitute an item of equal or greater value where the intended product is unavailable. Gifts are not transferable and no cash alternative is offered.

Gifts are limited to the first 50 pairs to qualify, ranked by the server timestamp at which the later of the two members reached their 100th qualifying day. There is no random selection.

8. Claiming

Qualifying entrants will be contacted at their registered email by December 20, 2026 and must reply with a valid delivery address by January 15, 2027. Entrants who do not respond by that date forfeit the gift. Where local delivery is unavailable and an item must be shipped across a border, any import duties or taxes are the recipient's responsibility.

9. Privacy

To administer this challenge, FlossBros processes your registration email, your partner's email, your stated country, and the account data described in section 6. The lawful basis is performance of the challenge terms you accept by entering.

If you qualify, your name and delivery address are shared with the retailer fulfilling the order (Amazon) for the sole purpose of delivering the gift. Delivery addresses are deleted within 90 days of shipment. Registration records are deleted by March 31, 2027. See the Privacy Policy for your rights, including access and erasure.

10. General

FlossBros may cancel, suspend, or modify the challenge if it cannot be run as planned for reasons outside its reasonable control, including fraud or technical failure. If the challenge is cancelled, FlossBros will publish notice on this page. These rules are governed by the laws of the sponsor's place of establishment, without affecting any mandatory consumer rights you have in your country of residence.

Questions: help@flossbros.app.