SmartShelf

✦ Go Pro

Cheapest Mouthwash in the UK

Prices updated 13 October 2026 · 262 products across 6 supermarkets

The best-value mouthwash in the UK right now is Stamford Street Co. Coolmint Fluoride Mouthwash 500ml at Sainsbury's — £1.48/litre (£0.74).
262Products Compared
6Supermarkets
£1.48Lowest /Litre

We compare mouthwash across all 7 major UK supermarkets — Tesco, Sainsbury's, Asda, Morrisons, Waitrose, Aldi and M&S — and rank by price per unit so you can see where mouthwash is genuinely cheapest. Prices update daily.

1Stamford Street Co. Coolmint Fluoride Mouthwash 500mlStamford Street Co. Coolmint Fluoride Mouthwash 500mlSainsbury'sBest value£1.48/litre£0.742Morrisons Essentials Coolmint Mouthwash 500mlMorrisons Essentials Coolmint Mouthwash 500mlMorrisons£1.48/litre£0.743Tesco Essentials Fresh Mint Mouthwash 500mlTesco Essentials Fresh Mint Mouthwash 500mlTesco£1.50/litre£0.754Tesco Essentials Cool Mint Mouthwash 500mlTesco Essentials Cool Mint Mouthwash 500mlTesco£1.50/litre£0.755Wisdom Fresh & Clean Mouthwash 500mlWisdom Fresh & Clean Mouthwash 500mlAsda£1.80/litre£0.906Sainsbury's Everyday Dental 10 in 1 Fluoride Mouthwash 600mlSainsbury's Everyday Dental 10 in 1 Fluoride Mouthwash 600mlSainsbury's£1.98/litre£1.197Sainsbury's Whitening Mouthwash 600mlSainsbury's Whitening Mouthwash 600mlSainsbury's£1.98/litre£1.198Sainsbury's Sensitive Mouthwash 600mlSainsbury's Sensitive Mouthwash 600mlSainsbury's£1.98/litre£1.199DENTITEX Mouthwash 0.5 LDENTITEX Mouthwash 0.5 LAldi£1.98/litre£0.9910DENTITEX Mouthwash 500 mlDENTITEX Mouthwash 500 mlAldi£1.98/litre£0.9911Pro Formula Complete Gum Health Mouthwash 500MlPro Formula Complete Gum Health Mouthwash 500MlTesco£2.50/litre£1.2512Pro-Formula Whitening Mouthwash 500MlPro-Formula Whitening Mouthwash 500MlTesco£2.50/litre£1.2513Morrisons Gum Health Mouthwash Fresh Mint 500mlMorrisons Gum Health Mouthwash Fresh Mint 500mlMorrisons£2.50/litre£1.2514ASDA Advanced 10-in-1 Mouthwash 500mlASDA Advanced 10-in-1 Mouthwash 500mlAsda£2.64/litre£1.3215Essential Fresh Mint MouthwashEssential Fresh Mint MouthwashWaitrose£2.90/litre£1.4516Colgate Triple Action Xtra White Mouthwash Alcohol Free 500mlColgate Triple Action Xtra White Mouthwash Alcohol Free 500mlAsda£3.46/litre£1.7317Listerine Cool Mint Intense Taste Classic Mouthwash 1LListerine Cool Mint Intense Taste Classic Mouthwash 1LAsda£4.00/litre£4.0018Listerine Flavours Spearmint 500mlListerine Flavours Spearmint 500mlAsda£4.00/litre£2.0019Listerine Spearmint Enamel Protection Mouthwash 250mlListerine Spearmint Enamel Protection Mouthwash 250mlTesco£4.40/litre£1.1020Colgate Triple Action Mouthwash Alcohol Free 500mlColgate Triple Action Mouthwash Alcohol Free 500mlTesco£4.50/litre£2.2521Colgate Triple Action Mouthwash Alcohol Free 500mlColgate Triple Action Mouthwash Alcohol Free 500mlSainsbury's£4.50/litre£2.2522Colgate Plax Cool Mint Mouthwash Alcohol Free 1000mlColgate Plax Cool Mint Mouthwash Alcohol Free 1000mlSainsbury's£4.50/litre£4.5023Colgate Triple Action Xtra White Mouthwash Alcohol Free 500m...Colgate Triple Action Xtra White Mouthwash Alcohol Free 500m...Sainsbury's£4.50/litre£2.2524Colgate Triple Action Mouthwash Alcohol Free 500mlColgate Triple Action Mouthwash Alcohol Free 500mlMorrisons£4.50/litre£2.25
See The Live Mouthwash Comparison →

Cheapest Mouthwash: FAQ

Where is the cheapest mouthwash in the UK?

Right now the best value mouthwash is Stamford Street Co. Coolmint Fluoride Mouthwash 500ml at Sainsbury's, £0.74 (£1.48/litre). SmartShelf ranks mouthwash by price per unit across 6 supermarkets, updated daily.

Which supermarket is cheapest for mouthwash?

We compare mouthwash across Tesco, Sainsbury's, Asda, Morrisons, Waitrose, Aldi and M&S. Today Sainsbury's has the cheapest option, but the ranking updates every day as prices change.

How does SmartShelf compare mouthwash prices?

We list each product's price per unit (£/kg, £/litre or per item) so you compare like for like, and we show loyalty prices such as Clubcard and Nectar where available — free, with no sign-up.