De Online Tandarts is a Dutch online retailer specialising in oral-care products for everyday dental hygiene and specific mouth-care needs. Its store serves customers in the Netherlands and several other European countries, including Belgium, Germany, France, Italy, Luxembourg, Portugal and Spain. The range includes electric and manual toothbrushes, replacement heads, interdental brushes, floss, toothpicks and water flossers, as well as toothpaste, mouthwash, sprays and gels.

Shoppers can also find tongue cleaners, denture and orthodontic accessories, gum, lip care and curated sets. Products cover concerns such as sensitive teeth, gum problems, dry mouth, bad breath, whitening and care for children. The website features established brands, promotional offers, customer reviews and practical articles about oral health and dental treatments.

Customers can browse information on conditions and procedures, and use the site to find an emergency dentist. De Online Tandarts offers online ordering, customer service and multiple payment options. The website states that a warehouse fire has temporarily affected order fulfilment, with service expected to resume in the week of 7 September