Replacement heads for a Philips Sonicare toothbrush can be purchased directly from the Sonicare division of Philips, as stated by the official Sonicare website. On the website, customers can select the model of their toothbrush to find the correct replacement head.
Dentists are also able to purchase Sonicare replacement heads so that they can offer their patients replacement heads. Patients can check with their dentist to see if they are a retailer of Sonicare products.
Brick-and-mortar stores and online retailers that sell dental products may offer Sonicare replacement heads.
Sonicare recommends that customers replace their brush head approximately every 3 months or whenever the brushes look worn, whichever is sooner. Only Sonicare replacement heads are recommended to ensure a quality product.