Order of use and replacement dates
Choose floss, an interdental brush, a toothbrush, a tongue cleaner or a water flosser, and the page looks up where that tool sits in the sequence it uses and what that step is for. Add the date you started using it and the replacement interval you have chosen, and it returns the replacement date, the days left as of today, the next two dates after that, and how many replacements fit into a year.
The arithmetic adds the interval in days to the start date, counts the difference from today at midnight in whole days, and divides 365 by the interval, rounding down, for the yearly count (as of October 2026). Month ends and leap days follow the calendar. If the date has already passed, the page reports how many days overdue it is.
For a toothbrush, the American Dental Association recommends replacement every 3-4 months, or sooner if the bristles are frayed; choose Toothbrush and leave the interval blank to use 90 days. Floss is normally used once and thrown away, and for interdental brushes, tongue cleaners and water flosser tips, follow the replacement guidance on the product. There is no official order of use (the ADA says flossing before or after brushing are both fine), so the page fixes one arrangement and reports position within it. No figure is offered for how much tongue cleaning achieves either. White patches on the tongue, lasting soreness or persistent bad breath are reasons to see a dentist or an ear, nose and throat clinician. This result is not medical advice.
Frequently asked questions
The American Dental Association (ADA) recommends replacing your toothbrush, or electric brush head, every 3-4 months, or sooner if the bristles are frayed. Choose Toothbrush and leave the interval blank to use 90 days (3 months) as the default. If your dentist has given you a different interval, enter that.
No. There is no official required order: the ADA says it does not matter whether you floss before or after brushing as long as you do a thorough job. This page fixes one arrangement and reports where your tool sits within it.
Because it counts only whole intervals inside 365 days. With a 90-day interval, 365 divided by 90 is 4.05, and four replacements complete within the year, so it shows four.