Is the Cordless Express worth it over a rechargeable Waterpik?

For travel or occasional use, yes: it is simple and needs no charger. For daily flossing, a rechargeable model like the Cordless Advanced gives more pressure settings, a bigger reservoir and lower running costs.

How often do I need to change the batteries?

Waterpik does not publish a fixed figure, and owners report widely different results. Expect to replace AA batteries more often with daily use than with travel-only use.

Does it come with replacement tips?

It includes two flossing tips. Replacement tips are standard Waterpik fittings, so the same tips used on other Waterpik models fit.

Can I use it with braces or implants?

Yes, water flossing is commonly used around braces and implants. The two pressure settings are limited, though, so an orthodontic tip and a model with more pressure choices may suit you better.

How does it compare with string floss?

Waterpik says it is up to twice as effective as string floss at reducing plaque and improving gum health. It reaches under the gumline and behind teeth, but it does not replace brushing.