Are you using a hammer drill? The Tapcon drill bits should be good for 10's if not hundreds of holes, especially in block.

There is a big difference between Vermont American and Bosch bits.
Also drill speed.
The smaller the bit and high speed is a recipe for burnout.

The bit that comes in a box of Tapcon screws will last for over 100 holes---IF you use a hammer drill. I have several that I've had for 12 years.

In fact, I used them not long ago to mount storage in my basement shop---concrete walls poured in 1965.

If you do not---might last two holes. There simply is no substitute in this case.

As Handymac stated.

If you bought a full box, There should have been a drill bit in the box.

Our local hardware store removes them (keep them from being stolen) and will give you the correct size bit for the screw when you buy a full box.

A bit should last you for years before wearing out if used correctly in a hammer drill. A dual purpose drill that has a "hammer" setting will have a hammer on the adjustment collar (looks like a T in the photo). The hammer setting is the one that is needed when using a concrete drill bit.

Drill your holes 1 1/2 times deeper than the screw is long. Example 1" screws = 1 1/2" deep hole. Then clean the hole out with air. Homeowners doing DIY projects can use canned compressed air like used for cleaning computers and such.