The problem was in the pin. On/Off seems to get stuck in the off state. The motor still pumped fairly well, but the water didn't come out of the handle. The sad thing is that it could be easily repaired if spare parts were available and if the handle could be detached (it can't). Threw it away after just a year.
Oral-B Professional Care OxyJet MD20 Irrigation, white/blue
64 Review
WaterPik WP-660 Aquarius Professional, white
66 Review
π¦· Ultra Waterpik WP-112 Water Flosser for Superior Oral Health
83 Review
Enhanced Dental Care: Philips π¦· Sonicare Airfloss Ultra, HX8432/13, Black Edition
40 Review
Wild Fuel Dental Probiotics: Fresh Breath & Healthy Bacteria Support - Vegan, Cruelty-Free Chewable Tablets for Oral Health - 45 Mint Flavored, Sugar-Free Travel Tin
14 Review
The Legend of Zelda: Breath of the Wild game for Nintendo Switch, cartridge
20 Review
π± Organic Peppermint and Parsley Oil Gel Capsules for Fresh Breath - Keto Friendly Stomach Mints with 3+ Hour Freshness - XL Size - Freshies
12 Review
BLIS Fresh Breath Kit: Potent BLIS K12 Oral Probiotic for Bad Breath & Halitosis Treatment - Clinically Proven Mouthwash, Tongue Scraper, Lozenges - 4 Week Supply
11 Review