Dr Jansen is very clumsy and absent-minded. He’s singing for example while performing something very delicate on your teeth. He even cut my tongue very badly with one of his machines and then said it was my fault.(It was painful for one entire week) Once I’ve been given an appointment and when I went there, the office was closed. The assistant made a mistake when giving me a date It is the worst dentist office I’ve ever been to, do not go there, they’re not serious.