There are several synonyms for the phrase "in the mouth" that can be used in writing or speech to avoid repetition. One alternative term is "on the tongue," which conveys a similar idea of something being tasted or experienced orally. Another option is "in the oral cavity," which is a more technical phrase but still accurately describes the location of something within the mouth. "Between the teeth" can also be used to describe something that is caught or lodged in the crevices of one's teeth. Lastly, "on the palate" refers specifically to the roof of the mouth and can be used to describe flavors or textures that are experienced in that area.