The most relevant part is probably another study mqrius mentions, "The effect of the loss of molar teeth on spatial memory and acetylcholine release from the parietal cortex in aged rats", Kato et al 1997 (available through Libgen):
...After the molar teeth of rats were extracted, the rats were fed with powdered food for 135 weeks. Although the performance in the radial arm maze was progressively acquired by daily training, an increase in the number of errors and a decrease in the initial correct responses were observed in the teethless aged rats c
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