I recommend the L-shaped interdental brush from Daiso.

I recommend the Daiso interdental brush! It is an affordable product at 2,000 won for a pack of 8, but it performs well, making it the best value for money! You can also choose the interdental hole diameter size; I purchased and am currently using the thinnest SSS size. It is also L-shaped and long, so it is very comfortable to use. I highly recommend it to anyone looking for a great value product.