<div class="form-check">
<input type="checkbox" class="form-check-input" id="materialChecked" checked>
<label class="form-check-label" for="materialChecked">Voorbeeld checkbox</label>
</div>
Based on the version from MDB:
https://mdbootstrap.com/javascript/checkbox/
The example begins checked. Remove the checked attribute if you want the element to start unchecked.