Some of the "compatible" replacement tips receive reviews of not fitting, being difficult to remove and/or twisting in the WaterPik. In my case at least, they come in and out easily, stay in place during use, and seem to do the same job as name brand parts.
π TheraBreath Fresh Breath Chewing Gum: ZINC with Citrus Mint Flavor - Pack of 6 (10 Count)
11 Review
π¦· Colgate Max Fresh Whitening Toothpaste with Breath Strips, Clean Mint, Limited Edition - 6 Oz, 24 Ounce (Pack of 4)
10 Review
Breath Me TM 50pcs Black Fiber Reed Diffuser Refill Sticks 12 inch - Elegant Home Fragrance Replacement
11 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