I don't know what the folks at Oral-B thought of that wobbly shape. Curves make it difficult to steer and control precisely. Perhaps there are two positions where he doesn't try to avoid. I tried replacing the (discontinued?) version on the right. Note that the handle is mostly straight. This brush is not a replacement. Its curves make it difficult to position and hold it accurately while brushing. I could feel the muscles in my arms getting tired just stopping them from turning. This is not a very good design.
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