Just check coupons out (with price alert and history). Do you want to know what the best price is?
Color White, Suitable For Suitable For Users With A Cavity / Staining / Or Plaque, Fit For Oclean Air, Brand Oclean, Model P1S6, Hardness €7 /00
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
1. ($11.89): BG75597c
2. ($13.15): BG00c906
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGXPAP255, BGHB218, tRaDetRaCKeR, BGHECARE1, BGf0265c, BG4ee866, Cuponation9
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Oclean P1S6 2Pcs Electric Toothbrush Heads? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).