4 Pcs Electric Toothbrush Heads Compatible with Fairywill D7/D8/FW507/FW508/FW551/917/959/SG-E9(20pcs Black)

- Fits specific electric toothbrush models, ensuring a tight, stable connection to prevent looseness during daily brushing. - The brush head structure supports effective cleaning, reaching between teeth and along gumlines to assist with daily oral care. - Designed for comfortable use, with bristles that balance gentle contact with teeth and gums for regular long-term brushing. - Made with durable materials to maintain bristle shape and integrity, reducing the need for frequent replacements. - Tool-free installation: simply remove the old brush head and attach the new one firmly for quick, hassle-free use.