Black dots on Hegen teat

Hello! My baby is using Hegen milk bottle and after almost 2 months, black dots start to appear on the teat. I experienced this twice. I know that teat need to change every 2-3 months. But is it normal? Do Mummies/Daddies using other milk bottle brands experience the same?

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used hegen for about 3years, never encountered this black dot issue. change every 2months