Cheapest Mouthwash in the UK

Prices updated 15 August 2026 · 218 products across 6 supermarkets

The best-value mouthwash in the UK right now is Morrisons Essentials Coolmint Mouthwash 500ml at Morrisons — £1.34/litre (£0.67).

218Products Compared

6Supermarkets

£1.34Lowest /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.

#	Product	Store	Price	Per Unit
1	Morrisons Essentials Coolmint Mouthwash 500ml	Morrisons	£0.67	£1.34/litre
2	Tesco Essentials Fresh Mint Mouthwash 500ml	Tesco	£0.75	£1.50/litre
3	Tesco Essentials Cool Mint Mouthwash 500ml	Tesco	£0.75	£1.50/litre
4	Stamford Street Co. Coolmint Fluoride Mouthwash 500ml	Sainsbury's	£0.80	£1.60/litre
5	Sainsbury's Everyday Dental 10 in 1 Fluoride Mouthwash 600ml	Sainsbury's	£1.07	£1.78/litre
6	Sainsbury's Whitening Mouthwash 600ml	Sainsbury's	£1.07	£1.78/litre
7	Sainsbury's Sensitive Mouthwash 600ml	Sainsbury's	£1.07	£1.78/litre
8	DENTITEX Mouthwash 0.5 L	Aldi	£0.89	£1.78/litre
9	Wisdom Fresh & Clean Mouthwash 500ml	Asda	£0.90	£1.80/litre
10	Wisdom Fresh & Clean Antibacterial Mouthwash Cool Mint 500ml	Asda	£0.90	£1.80/litre
11	Pro Formula Complete Gum Health Mouthwash 500Ml	Tesco	£1.25	£2.50/litre
12	Pro-Formula Whitening Mouthwash 500Ml	Tesco	£1.25	£2.50/litre
13	Morrisons Gum Health Mouthwash Fresh Mint 500ml	Morrisons	£1.25	£2.50/litre
14	ASDA Advanced 10-in-1 Mouthwash 500ml	Asda	£1.32	£2.64/litre
15	Essential Fresh Mint Mouthwash	Waitrose	£1.45	£2.90/litre
16	Colgate Triple Action Xtra White Mouthwash Alcohol Free 500ml	Asda	£1.73	£3.46/litre
17	Listerine Flavours Spearmint 500ml	Asda	£2.00	£4.00/litre
18	Listerine Spearmint Enamel Protection Mouthwash 250ml	Tesco	£1.10	£4.40/litre
19	Colgate Triple Action Mouthwash Alcohol Free 500ml	Asda	£2.23	£4.46/litre
20	Colgate Triple Action Mouthwash Alcohol Free 500ml	Tesco	£2.25	£4.50/litre
21	Colgate Triple Action Mouthwash Alcohol Free 500ml	Sainsbury's	£2.25	£4.50/litre
22	Colgate Plax Cool Mint Mouthwash Alcohol Free 1000ml	Sainsbury's	£4.50	£4.50/litre
23	Colgate Triple Action Xtra White Mouthwash Alcohol Free 500m...	Sainsbury's	£2.25	£4.50/litre
24	Colgate Triple Action Mouthwash Alcohol Free 500ml	Morrisons	£2.25	£4.50/litre

See The Live Mouthwash Comparison →

Cheapest Mouthwash: FAQ

Where is the cheapest mouthwash in the UK?

Right now the best value mouthwash is Morrisons Essentials Coolmint Mouthwash 500ml at Morrisons, £0.67 (£1.34/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 Morrisons 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.