diff --git a/src/wp-includes/class-wp-editor.php b/src/wp-includes/class-wp-editor.php
index 835a2a5fef..b20126f53e 100644
--- a/src/wp-includes/class-wp-editor.php
+++ b/src/wp-includes/class-wp-editor.php
@@ -554,6 +554,16 @@ final class _WP_Editors {
 					// Limit the preview styles in the menu/toolbar
 					'preview_styles' => 'font-family font-size font-weight font-style text-decoration text-transform',
 
+					// Disable H1 in the drop-down and the menu.
+					'block_formats' => 
+						'Paragraph=p;' .
+						'Heading 2=h2;' .
+						'Heading 3=h3;' .
+						'Heading 4=h4;' .
+						'Heading 5=h5;' .
+						'Heading 6=h6;' .
+						'Preformatted=pre',
+
 					'end_container_on_empty_block' => true,
 					'wpeditimage_disable_captions' => $no_captions,
 					'wpeditimage_html5_captions' => current_theme_supports( 'html5', 'caption' ),
@@ -609,7 +619,7 @@ final class _WP_Editors {
 				$mce_buttons = apply_filters( 'teeny_mce_buttons', array('bold', 'italic', 'underline', 'blockquote', 'strikethrough', 'bullist', 'numlist', 'alignleft', 'aligncenter', 'alignright', 'undo', 'redo', 'link', 'unlink', 'fullscreen'), $editor_id );
 				$mce_buttons_2 = $mce_buttons_3 = $mce_buttons_4 = array();
 			} else {
-				$mce_buttons = array( 'bold', 'italic', 'strikethrough', 'bullist', 'numlist', 'blockquote', 'hr', 'alignleft', 'aligncenter', 'alignright', 'link', 'unlink', 'wp_more', 'spellchecker' );
+				$mce_buttons = array( 'formatselect', 'bold', 'italic', 'bullist', 'numlist', 'blockquote', 'alignleft', 'aligncenter', 'alignright', 'link', 'unlink', 'wp_more', 'spellchecker' );
 
 				if ( ! wp_is_mobile() ) {
 					if ( $set['_content_editor_dfw'] ) {
@@ -631,7 +641,7 @@ final class _WP_Editors {
 				 */
 				$mce_buttons = apply_filters( 'mce_buttons', $mce_buttons, $editor_id );
 
-				$mce_buttons_2 = array( 'formatselect', 'underline', 'alignjustify', 'forecolor', 'pastetext', 'removeformat', 'charmap', 'outdent', 'indent', 'undo', 'redo' );
+				$mce_buttons_2 = array( 'strikethrough', 'hr', 'forecolor', 'pastetext', 'removeformat', 'charmap', 'outdent', 'indent', 'undo', 'redo' );
 
 				if ( ! wp_is_mobile() ) {
 					$mce_buttons_2[] = 'wp_help';