Without Trial and Error or a dental professional, how can you determine your size of Interdental Brush?

Question

How can you determine by himself which size of TePe Interdental Brushes fits (your Interproximal Space)?

Disregard and pretermit:

1. Trial and Error (ie: randomly selecting a size, and then purchasing a pack of these brushes)
2. or seeing the dental professional (e.g. dentist, oral hygienist) for him/her to determine the size (to avert costs).

Answer 1

Some companies offer a probe that allows you to measure on your own the spaces between the teeth. Here is an example