By interlocking teeth I mean teeth that fit perfectly together in a zipper or puzzle-like fashion, but don't literally stick together. What would the problems and benefits of this arrangement be?
Pictures included for any confusion on what I mean.
These particular teeth are nearly flat, likened to incisors.
The alien these teeth belong to are small, lizardy creatures that have adapted solely to feed on a specific kind of soft fruit. The fruits are spongy, nearly cake-like in texture, and could hypothetically be swallowed whole if you really wanted to without much danger.