Zenyum has hung a National Day banner across its own Singapore store, and the announcement bar states the terms plainly: "[3 - 9 August] National Day Sale: 61% OFF Bundle, 40% OFF Favourites". Three products are actually in it. We priced all three against Zenyum's own catalogue.

> Quick view: National Day Bundle $90.90 (Zenyum's U.P. $233.30 — 61% off, five pieces) · Waterflosser Go $65.90 (U.P. $109.90, 40% off) · ZenyumBright Instant Whitening Strips 28s $41.90 (U.P. $69.90, 40% off) · 3–9 August 2026 only · zenyum.sg online only · free shipping above $40 · the "$115.90 Waterflosser Go + Tips" bundle listing is $33.10 more than buying the same two items separately.

1. The National Day Bundle — $90.90, five pieces

What is in the box, with each item's own everyday price on Zenyum's site in brackets:

  • ZenyumSonic™ Electric Toothbrush 2.0 *($89.90)* — 5 modes (Clean, White, Deep Clean, Gentle, Gum Massage), up to 45,000 VPM, 90 days of battery on Zenyum's own two-brushes-a-day assumption
  • ZenyumSonic™ Refill Gentle Clean Brush Head 4-Pack *($35.90)* — the sensitive-teeth/gums heads
  • ZenyumFresh™ Floss *($5.90)* — charcoal-activated mint, 50 pieces
  • ZenyumBright™ Invisible Whitening Strips, 14 strips *($39.90)* — peroxide-free, peppermint
  • Relief + Guard Sensitivity Toothpaste 100g *($9.90)*

Available in Black, White or Pink.

The 61% claim, checked

Zenyum's stated U.P. of $233.30 is not an invented anchor. Add the five items' own listed usual prices — $119.90 + $43.60 + $6.90 + $49.90 + $12.90 — and you get $233.20, ten cents off their number. The arithmetic holds.

But nobody pays U.P. at Zenyum. Of the 59 products in its Singapore catalogue, we counted 58 currently showing a discount. Priced at the everyday numbers actually on the site today, the same five items cost $181.50:

ItemU.P.Everyday price today
ZenyumSonic™ Electric Toothbrush 2.0$119.90$89.90
Refill Gentle Clean Brush Head 4-Pack$43.60$35.90
ZenyumFresh™ Floss$6.90$5.90
ZenyumBright™ Invisible Whitening Strips (14)$49.90$39.90
Relief + Guard Sensitivity Toothpaste 100g$12.90$9.90
Total$233.20$181.50

So $90.90 is about 50% off what you would actually pay any other week — not 61%. That is still the deepest cut on the site: nothing else in the catalogue beats it, the next-deepest is the New Smile Ritual Kit 2.0 at $117.90 (U.P. $228.20, 48% off), then the two 40% items below, and after that nothing above 27%. The deal is real. The headline is just doing more work than the price is.

The practical way to read it: the brush alone is $89.90 every other week, so the bundle adds $91.60 of everyday-priced extras for one dollar.

2. Waterflosser Go — $65.90 (U.P. $109.90)

Cordless, 4 modes (Soft, Standard, Pulse, DIY), retractable water tank, 2 tips included, tip storage, 1-year warranty. Purple, Grey, Pink and Blue.

Do not buy the ready-made combo. Zenyum also lists a *Waterflosser Go + Jet Tips Refill 2-Pack* at $115.90 — that listing never got repriced for the sale. Assembled yourself during the sale:

  • Zenyum Waterflosser Go — $65.90
  • Zenyum Waterflosser Go Tips Refill 2-Pack — $16.90
  • Total: $82.80 — the same two boxes, $33.10 cheaper

Both routes clear the $40 free-shipping threshold, so splitting costs you nothing in delivery.

3. ZenyumBright™ Instant Whitening Strips 28s — $41.90 (U.P. $69.90)

The newer dual-action strip: peroxide-free, enamel-safe, soft mint, 30 minutes a day. Zenyum claims visible brightness after one use and up to 4 shades in 14 days — from a manufacturer-conducted study using the VITA Bleachguide 3D-MASTER assessment, with the usual "individual results may vary".

Two things worth knowing before you pick between the strip packs:

  1. Per strip, the 28s is the better buy. $41.90 for 28 works out to about $1.50 a strip, against about $2.85 for the 14-strip Invisible pack at its everyday $39.90.
  2. The bundle's strips are the 14-strip pack, and Zenyum's own "up to 4 shades whiter" footnote on that product is based on 28 treatments. One pack is half a course — plan on a top-up if you are chasing the advertised result.

The fine print

  1. 3–9 August 2026 only. 9 August is National Day itself, so this closes on the holiday.
  2. Online only, at zenyum.sg. Not a pharmacy-counter deal.
  3. Free shipping above $40 — all three items clear it on their own.
  4. "U.P." is not a market price here. Zenyum's catalogue runs a standing discount on nearly everything, so compare against the everyday price, not the crossed-out one.
  5. The performance numbers are the brand's. 45,000 VPM, 90-day battery, "4 shades whiter" — all Zenyum's own figures or manufacturer-run studies. Read them as marketing, not clinical evidence.

Should you buy it?

Yes, if you were replacing a dying electric toothbrush anyway. $90.90 for a sonic brush plus roughly a year of heads, floss, a sensitivity toothpaste and a strip pack is below what a comparable Philips Sonicare or Oral-B starter kit costs at Guardian or Watsons once you add the consumables.

No, if you already own a ZenyumSonic — you would be paying mostly for a second handle. Take the Waterflosser Go at $65.90 instead; at 40% off it is the better standalone value this week.

Also no, if you specifically want a pressure sensor or app tracking. That is not what this brush is, at any discount.

Related

*Prices, dates and product contents verified on 4 August 2026 against Zenyum's own Singapore store (zenyum.sg) — its site-wide announcement bar reading "[3 - 9 August] National Day Sale: 61% OFF Bundle, 40% OFF Favourites", the National Day Bundle product page, and the individual product listings for every item priced above. Discount percentages are our own calculations from Zenyum's published figures. Prices and terms are set by Zenyum and can change without notice — confirm in your cart before checking out. Cover image: Zenyum's own National Day Special campaign artwork (photo: Zenyum official).*