make a phrase within a section of code bold

I have the following code which is working perfectly:

<script>
  window.addEventListener('DOMContentLoaded', (event) => {
    var products = document.querySelectorAll('.product-price'), sf;
    for (sf=0; sf<products.length; sf++) {
      var price = products[sf];
      if (price.innerText.replace(/[^\d]+/g , "") === '000') {
        price.textContent = 'A Skin Review is Needed Prior to Purchasing Skin Better Science Products'; 
      }
    }
  });
</script>

I would like to make it so that the phrase 'A Skin Review is Needed Prior to Purchasing Skin Better Science Products' is bold. I'm not sure where to add in the necessary code into this to make it happen 

(extreme code rookie question - apologies!)

Can you share link to page where you added this text? We can help easier