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You Can’t Even Replace The Battery in the “Green” Suri Toothbrush
(www.ifixit.com)
Whether it be electronics, automobiles or medical equipment, the manufacturers should not be able to horde “oem” parts, render your stuff useless if you repair it with aftermarket parts, or hide schematics of their products.
Summary video by Marques Brownlee
Great channel covering and advocating right to repair, Lewis Rossman
Read the article - they do lots of stuff right, better than other well known toothbrush makers, and you can open the brush. But it may hamper the waterproofing, so they don't recommend it.
I will consider this instead of OralB or Philips the next time I need a new brush 😊