Prices updated daily — 23 October 2026
Product type overview
mouthwash sits within Oral Care, part of Health, Baby & Personal Care. On this page you compare 143 products from 9 UK supermarkets: Aldi, ASDA, Co-op, Iceland, Morrisons, Ocado, Sainsbury's, Tesco and Waitrose. The lowest unit price for mouthwash is £1.42/l at ASDA. In total, 7 variants of mouthwash are compared (different pack sizes and compositions). All prices are normalised to the same unit (per kilogram, per litre or per piece) so that packs of different sizes can be compared fairly — a larger pack is not automatically the best value. The ranking below shows, per variant, which supermarket currently has the sharpest price, including own-label products alongside national brands. Prices refresh daily from the retailers' own public price lists, so you never see stale offers when planning your weekly shop. Allsupers uses no affiliate links or paid placement; the ranking is purely price-based and updated from public data.
Cheapest mouthwash
Compare 142 products priced per litre across 9 supermarkets (143 in total)
mouthwash — compare prices across 9 supermarkets
JUST ESSENTIALS by ASDA
JUST ESSENTIALS by ASDA Just Essentials by Alcohol Free Cool Mint Mouthwash 500ml
500 ml
£1.42/litre
at 1 supermarket
Morrisons
Morrisons Essentials Coolmint Mouthwash 500ml
500 ml
£1.48/litre
at 1 supermarket
Unbranded
Stamford Street Co. Coolmint Fluoride Mouthwash 500ml
500 ml
£1.48/litre
at 1 supermarket
TESCO ESSENTIALS
Tesco Essentials Fresh Mint Mouthwash 500ml
500 ml
£1.50/litre
at 1 supermarket
TESCO ESSENTIALS
Tesco Essentials Cool Mint Mouthwash 500ml
500 ml
£1.50/litre
at 1 supermarket
Wisdom
Wisdom Fresh & Clean Antibacterial Mouthwash Cool Mint 500ml
500 ml
£1.80/litre
at 1 supermarket
Sainsbury's
Sainsbury's Everyday Dental 10 in 1 Fluoride Mouthwash 600ml
600 ml
£1.98/litre
at 1 supermarket
Sainsbury's
Sainsbury's Sensitive Mouthwash 600ml
600 ml
£1.98/litre
at 1 supermarket
Sainsbury's
Sainsbury's Whitening Mouthwash 600ml
600 ml
£1.98/litre
at 1 supermarket
DENTITEX
Mouthwash
500 ml
£1.98/litre
at 1 supermarket
ASDA
ASDA Advanced 10-in-1 Peppermint Mouthwash 500ml
500 ml
£2.34/litre
at 1 supermarket
PRO FORMULA
Pro Formula Complete Gum Health Mouthwash 500Ml
500 ml
£2.50/litre
at 1 supermarket
PRO FORMULA
Pro-Formula Whitening Mouthwash 500Ml
500 ml
£2.50/litre
at 1 supermarket
Morrisons
Morrisons Gum Health Mouthwash Fresh Mint 500ml
500 ml
£2.50/litre
at 1 supermarket
Waitrose Ltd
Essential Fresh Mint Mouthwash
500 ml
£2.90/litre
at 1 supermarket
Colgate
Colgate Triple Action Xtra White Mouthwash Alcohol Free 500ml
500 ml
£3.46/litre
at 2 supermarkets
Colgate
Colgate Plax Cool Mint Mouthwash Alcohol Free
1 litre
£3.80/litre
at 3 supermarkets
Listerine
Listerine Flavours Spearmint 500ml
500 ml
£4.00/litre
at 1 supermarket
Colgate
Colgate Plax Cool Mint Mouthwash Alcohol Free 500ml
500 ml
£4.00/litre
at 5 supermarkets
Listerine
Listerine Fresh Ginger & Lime Milder Taste
500 ml
£4.00/litre
at 1 supermarket
Listerine
Listerine Smartrinse Mild Mint Kids Mouthwash 6+ Years 500ml
500 ml
£4.00/litre
at 2 supermarkets
Listerine
Listerine Essentials Cool Mint Mouthwash 1L
1 litre
£4.15/litre
at 3 supermarkets
Listerine
Listerine Cool Mint Intense Mint Classic Mouthwash
1 litre
£4.15/litre
at 1 supermarket
LISTERINE
Listerine Spearmint Enamel Protection Mouthwash 250ml
250 ml
£4.40/litre
at 1 supermarket
ASDA
ASDA Chlorhexidine Peppermint Antibacterial Alcohol Free Mouthwash 300ml
300 ml
£4.40/litre
at 1 supermarket
Colgate
Colgate Triple Action Mouthwash Alcohol Free 500ml
500 ml
£4.46/litre
at 4 supermarkets
Colgate
Colgate Plax Soft Mint Mouthwash Alcohol Free 500ml
500 ml
£4.50/litre
at 4 supermarkets
Listerine
Listerine Flavours Mild & Minty Mouthwash 250ml
250 ml
£4.60/litre
at 1 supermarket
Colgate
Colgate Plax Cool Mint Mouthwash Alcohol Free 250ml
250 ml
£5.00/litre
at 2 supermarkets
Colgate
Colgate Total Plaque Protect Peppermint Mouthwash 500ml
500 ml
£5.00/litre
at 5 supermarkets
Colgate
Colgate Max White Expert Whitening Mouthwash Alcohol Free 500ml
500 ml
£5.00/litre
at 3 supermarkets
Colgate
Colgate Total Active Prevention+ Deep Clean Spearmint Mouthwash 500ml
500 ml
£5.00/litre
at 3 supermarkets
PRO FORMULA
Pro Formula Alcohol Free Mouthwash Clean Mint 300Ml
300 ml
£5.00/litre
at 1 supermarket
Colgate
Colgate Max White Purple Reveal Teeth Whitening Mouthwash Alcohol Free
500 ml
£5.00/litre
at 1 supermarket
Listerine
Listerine Cool Mint Mild Taste Alcohol Free Mouthwash 500ml
500 ml
£5.18/litre
at 2 supermarkets
Listerine
Listerine Fresh Burst Intense Taste Classic Mouthwash 500ml
500 ml
£5.18/litre
at 3 supermarkets
Listerine
Listerine Listerine Cool Mint Mouthwash 500ml
500 ml
£5.18/litre
at 4 supermarkets
Listerine
Listerine Cool Mint Extra Mild Alcohol Free Mouthwash 500ml
500 ml
£5.18/litre
at 3 supermarkets
LISTERINE
Listerine Zero Alcohol Cool Mint Milder Taste Mouthwash 500ml
500 ml
£5.20/litre
at 2 supermarkets
Waken
Waken Whitening Mouthwash PepperMint
500 ml
£5.24/litre
at 3 supermarkets
Waken
Waken Advanced Care Mouthwash
500 ml
£5.24/litre
at 3 supermarkets
Waken
Waken Enamel Care Mouthwash
500 ml
£5.24/litre
at 2 supermarkets
Listerine
Listerine Total Care Stay White Intense Taste Classic Mouthwash 1L
1 litre
£5.25/litre
at 2 supermarkets
Listerine
Listerine Total Care Intense Taste Classic Mouthwash 1L
1 litre
£5.25/litre
at 4 supermarkets
Colgate
Colgate Max White Purple Reveal Mouthwash 500ml
500 ml
£5.50/litre
at 1 supermarket
Listerine
Listerine Total Care Teeth & Gum Intense Mint Classic Mouthwash
500 ml
£5.60/litre
at 2 supermarkets
Listerine
Listerine Total Care Stay White Intense Mint Classic Mouthwash
500 ml
£5.60/litre
at 2 supermarkets
Listerine
Listerine Total Care 10-in-1 Benefit Clean Mint Mouthwash 500ml
500 ml
£5.60/litre
at 3 supermarkets
Listerine
Listerine Total Care Mild Mint Alcohol Free Mouthwash
500 ml
£5.60/litre
at 2 supermarkets
Listerine
Listerine Total Care Stay White Arctic Mint Mouthwash 500ml
500 ml
£5.60/litre
at 2 supermarkets