Abstract: Introduced here is technology to monitor moisture levels in a hygiene product, such as tampons, pads, menstrual cups, child diapers, adult diapers etc. According to one embodiment, a moisture sensor is inserted inside a feminine hygiene product. The moisture sensor is connected to a wearable device that gathers the moisture data and sends the data to a mobile device, such as a cell phone. The cell phone generates notifications to the user, such as percentage saturation of the feminine hygiene product, message to change the feminine hygiene product, expected start and end dates of the next menstrual cycle, etc. According to another embodiment, the moisture sensor can be inserted in other hygiene products, such as child diapers or adult diapers, to measure the amount of urination, defecation, or other excretions, and to generate notifications to the user, the user's caretaker, or a third party.