Dentists recommend that you should change your toothbrush every 3 months to ensure you’re giving your teeth the best possible clean.
When a toothbrush gets old, it stops being as effective which is why some toothbrushes use coloured bristles which fade over 3 months of use, clearly showing you when it’s time to change your toothbrush.
If you notice that the bristles on your toothbrush have become worn - they might become rough and change direction - it might be time to change it.