# Mouth Through the Years > The mouth's community shifts with teeth, hormones, diet and medication. A life stage tour from first teeth to later years. ## Guides - [Infant Mouth Bacteria](https://oral-microbiome-and-age.haqatoxu.workers.dev/infant-mouth-bacteria/): Infant mouth bacteria begin settling in the first hours and days after birth and keep changing as feeding, first teeth and new foods arrive. - [Mouth Changes in the Teen Years](https://oral-microbiome-and-age.haqatoxu.workers.dev/teen-mouth-changes/): Teen mouth changes come from a mix of hormones, braces, snacking and drink habits, and irregular routines, all of which can shift the bacteria on the teeth and. - [Adult Mouth Stability](https://oral-microbiome-and-age.haqatoxu.workers.dev/adult-mouth-stability/): Adult mouth stability describes a period when the bacterial community is relatively settled, but it is not frozen; stress, sleep, diet, smoking and dental work. - [The Mouth in Later Life](https://oral-microbiome-and-age.haqatoxu.workers.dev/mouth-in-later-life/): The mouth in later life tends to shift because of dry mouth, worn or receded gums, dental work and long-term health conditions, and the community of bacteria. - [Medication Effects Across Life Stages](https://oral-microbiome-and-age.haqatoxu.workers.dev/medication-effects-on-mouth/): Many common medicines can alter saliva, gums or taste, so medication effects on mouth health show up at every life stage, from childhood syrups to long-term. ## About - [About Mouth Through the Years](https://oral-microbiome-and-age.haqatoxu.workers.dev/about/): not medical advice, how the site is funded and how guides are made ## Optional - [RSS feed](https://oral-microbiome-and-age.haqatoxu.workers.dev/feed.xml)