Why does Touch ID expire after a few days on my iPad?

Be assured, you are not alone in having difficulty using TouchID. I too have seasonal issues with TouchID devices, usually during winter, when humidly is low and skin is particularly dry.

TouchID is usually reliable with regular use (the sensor updates its biometric map with every successful fingerprint authentication), however, prevailing conditions can be problematic for a completely healthy TouchID sensor.

Start here >>>

• Use Touch ID on iPhone and iPad - Apple Support
•  If Touch ID isn't working on your iPhone or iPad - Apple Support

Some users just have difficulty using TouchID. The causes for of TouchID being unreliable for some users - and not others - are many. Whilst not an exhaustive list, possibilities include:

• Very high humidity (“sweaty” fingers)
• Very low humidity (excessively dry skin)
• Poor fingerprint ridge-detail (excessive hand washing - or exposure to abrasive material, damaging fingerprint detail)
• Physical injury (cuts or splits to the fingertip)

If you have naturally dry skin, try using a “light” (non greasy) and easily absorbed skin moisturiser.

As we age, our skin loses collagen - and this in turn leads to loss of elasticity and the ability to naturally retain moisture. This will inevitably impact fingerprint ridge detail; for some users, our age (and health) can be relevant. 🙂

halfpricemike wrote:

I have to change my iPad fingerprint password every few days the fingerprint stops working after that time

Indeed, that's not normal.

I'd suggest that you make an make an appointment (*) and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> https://locate.apple.com/choose-country-region . After checking it out, they'll give you all the available options.

Regards

Giulio

(*) You can do it:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above;
• Using the "Apple Store" app, available and downloadable from AppStore.