According to the description they are compatible with the FW507. They are NOT compatible. Not even close. They don't stay on base and are of extremely poor quality.
πͺ White Oral-B Vitality Electric Toothbrush with FlossAction for Improved Oral Health
125 Review
Soocas X5 sonic toothbrush, RU, pink
76 Review
Oral B Vitality Limited Precision Clean π¦· Rechargeable Toothbrush - White Refill for Optimal Oral Cleanliness
83 Review
π‘ 4 Pack of Oral-B Cross Action Electric Toothbrush Replacement Brush Heads
61 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
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
π TheraBreath Fresh Breath Chewing Gum: ZINC with Citrus Mint Flavor - Pack of 6 (10 Count)
11 Review
Convenient Listerine Ready! Tabs Whitening Chewable Tablets: Polar Mint Flavor to π¦· Combat Bad Breath, Whiten Teeth, and Eliminate Germs Anywhere, 24 ct, Sugar-Free, Gluten-Free
11 Review